EATON VANCE SPECIAL INVESTMENT TRUST
N-30D, 1998-03-18
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<PAGE>
 
[LOGO     Investing                                        [PHOTO OF
APPEARS   for the                                          CALCULATOR &
HERE]     21st                                             FINANCIAL NEWSPAPER
          Century                                          APPEARS HERE]




Annual Report December 31, 1997



                                      EV

                                   MARATHON

                                 TOTAL RETURN

                                    FUND   

[PHOTO OF NYSE FLAG
APPEARS HERE]
                                  Eaton Vance

                     Global Management-Global Distribution

                                                               M a r a t h o n

[PHOTO OF FLOOR OF NYSE
APPEARS HERE]




<PAGE>
 
EV Marathon Total Return Fund as of December 31, 1997

LETTER TO SHAREHOLDERS

[PHOTO APPEARS HERE]

For the year ended December 31, 1997, EV Marathon Total Return Fund had a total
return of 15.3%./1/ This return resulted from a decrease in net asset value to
$9.67 per share on December 31, 1997 from $10.10 per share on December 31, 1996
and the reinvestment of $0.296 in income dividends and $1.555 per share in
capital gains distributions. By comparison, the average total return for mutual
funds in the Lipper Utility Funds Category* was 26.0% for the period.

The U.S. economy continued to grow at a healthy rate in 1997. Gross domestic
product, the primary indicator of economic performance, increased 3.8%,
exceeding most predictions made at the beginning of the year. Unemployment
declined 0.6% to 4.7%, and 3.2 million new jobs were created. The inflation
rate, which historically has risen after periods of sustained growth and low
unemployment, declined from the previous year. The consumer price index
increased only 1.7% in 1997, compared to 3.3% in 1996, and wholesale prices
decreased 1.2% -- the largest drop since 1986. Many economists, including
Federal Reserve Chairman Alan Greenspan, attribute this continued low inflation
to the effects of increasing global competition, a strong dollar, and higher
productivity brought on by advances in technology.

The stock market's performance in 1997 exceeded 20% for a record third
consecutive year. The S&P 500 Index* rose 31% during the year, with a
relatively small group of large capitalization stocks providing the leadership.
There was considerable volatility during the year, marked by significant market
declines -- the first in the spring, and a second, steeper decline in October
caused by economic turmoil in several important Asian countries. In both cases,
stock prices recovered.

For utility stocks, 1997 represented another year of change brought on by
deregulation of the telecommunications and electric utility industries. In
telecommunications, companies continued to battle between the courts and the FCC
over making local and long distance services more competitive. Meanwhile, the
electric utilities struggled to pass deregulation measures at the state level.
Both industries offer great challenges and opportunities for the investor.

The stock market's increased volatility and the changing utility environment
illustrate the importance of maintaining a long-term investment outlook. By
staying with an investment through the inevitable market cycles, investors can
reduce the impact of any one downturn. Moreover, a diversified investment such
as a professionally managed mutual fund further reduces risk. In the pages that
follow, Portfolio Manager Timothy P. O'Brien discusses the utility industries
and the performance of EV Marathon Total Return Fund in 1997.

                                        Sincerely,

                                        /s/ James B. Hawkes 
                                  
                                        James B. Hawkes,
                                        President
                                        February 9, 1998

- --------------------------------------------------------------------------------


Performance/2/
- --------------------------------------------------------------------------------

Average Annual Total Returns (at net asset value)
- --------------------------------------------------------------------------------
One Year                         15.3%

Life of Fund (11/1/93)            7.3

SEC Average Annual Total Returns (including applicable CDSC)
- --------------------------------------------------------------------------------
One Year                         10.5%

Life of Fund (11/1/93)            7.0
 
Ten Largest Equity Holdings/3/
- --------------------------------------------------------------------------------
Bellsouth Corp.                   5.1%
SBC Communications, Inc.          4.4
Energis PLC                       4.1
KN Energy                         3.9
NIPSCO Industries, Inc.           3.9
DQE, Inc.                         3.8
ACC Corp.                         3.7
Pinnacle West Capital Corp.       3.6
DPL, Inc.                         3.5
National Grid Holdings            3.3

/1/  This return does not include the applicable contingent deferred sales
     charge (CDSC).

/2/  Returns are calculated by determining the percentage change in net asset
     value with all distributions reinvested. SEC returns reflect the Fund's
     applicable CDSC based on the following schedule: 5%-1st year; 5%-2nd
     year; 4%-3rd year; 3%-4th year; 2%-5th year; 1%-6th year.

/3/  By total net assets. Ten largest holdings are as of 12/31/97 only and may
     not be representative of the Portfolio's current or future investments.
     Holdings accounted for 39.3% of the Portfolio's investments, determined by
     dividing the total market value of the holdings by the total net assets of
     the Portfolio.

*    It is not possible to invest directly in a Lipper Category or an Index.

     Past performance is no guarantee of future results. Investment return and
     principal value will fluctuate so that shares, when redeemed, may be worth
     more or less than their original cost.

- --------------------------------------------------------------------------------
Mutual fund shares are not insured by the FDIC and are not deposits or other
obligations of, or guaranteed by, any depository institution. Shares are subject
to investment risks, including possible loss of principal invested.
- --------------------------------------------------------------------------------

                                       2
<PAGE>
 
EV Marathon Total Return Fund as of December 31, 1997

MANAGEMENT DISCUSSION


An interview with Timothy P. O'Brien, Vice President and Portfolio Manager of
the Total Return Portfolio


[PHOTO OF TIMOTHY P. O'BRIEN APPEARS HERE]

Timothy P. O'Brien,
Portfolio Manager


Q:  Tim, how would you summarize 1997 for the three main utility industries --
    electric, telephone and natural gas?

A:  For the full year, telephone stocks outperformed the broad equity market,
    while electric utility stocks and natural gas stocks substantially
    underperformed. After struggling for much of the year, both telephone and
    electric utility stocks rallied in the fourth quarter, aided by a rally in
    the bond market and by a flight of capital from technology stocks and
    particularly from companies exposed to emerging markets or to competitors
    based in emerging markets. Natural gas stocks, which have a relatively small
    weighting in the Fund, were hurt by falling energy prices generally and
    forecasts of slowing worldwide demand.


Five Largest Equity Sectors+
- --------------------------------------------------------------------------------
As a percentage of total net assets

Electric Utilities                      29.2%

Telephone Utilities                     24.7%

Real Estate Investment Trusts           23.4%

Petroleum Stocks                         5.0%

Natural Gas Utilities                    3.9%

+  Sector allocation is subject to change due to active management.


Q:  Why is deregulation in the electric utility industry moving at such a slow
    pace?

A:  Some parts of the industry, such as wholesale electric generation, are well
    on their way to becoming fully competitive. A competitive wholesale
    electricity market exists already in the U.S., and it won't be long before
    the retail market will be opened up equally to all buyers. The market for
    retail electricity, however, remains mired in regulatory and legal problems.
    Several issues are slowing deregulation of retail electric companies,
    including recouping "stranded costs" -- utility investments in obsolete or
    nuclear power plants and high-cost contracts -- and the complexity of
    legislating new distribution and pricing systems.

Q:  The Fund has a sizable weighting in real estate investment trusts (REITs).
    What kind of year was 1997 for this sector?

A:  The performance of REITs is typically related to the commercial real estate
    market, which had a very stable, and therefore good year in 1997. In a
    strong economy such as we had, REITs tend to do what they are supposed to 
    do -- provide high income along with stability of principal. Normally, REIT 
    shares would rally in a declining interest rate environment, providing the
    investor with some capital appreciation in addition to a high level of
    income. Unfortunately, that did not happen this year, so our REIT positions
    did not give us the performance we had hoped for.

    Generally speaking, REITs have higher dividend yields than utility stocks,
    and, at this stage in an economic cycle, substantially higher dividend
    growth rates than utility shares. This healthy dividend income is an
    important component for a total return fund. Going forward, we intend to
    place more emphasis on growth of principal -- the other component of total
    return -- to improve annual returns.

                                       3
<PAGE>
 
EV Marathon Total Return Fund as of December 31, 1997

MANAGEMENT DISCUSSION CONT'D


Q:  Were you disappointed with any particular sectors or holdings this year?

A:  In hindsight, our weightings in REITs should have been reduced, and those in
    electric and telephone stocks ought to have been higher. This would have
    resulted in stronger fourth quarter performance, which would have helped the
    Fund's overall performance for the year.

Q:  How does this Fund's yield compare with others in its peer group?

A:  The Fund's yield is among the highest in its peer group. Our goal is to
    improve the total return of the Fund, which would shift the investment
    emphasis towards stocks with higher growth potential. This may reduce the
    yield somewhat, but a higher overall return should be worth the reduction in
    income.

Q:  What is your outlook for the electric utility and telecommunications sectors
    in 1998?

A:  Electric utility stocks are likely to perform reasonably well in 1998,
    because valuations, while up, are still reasonable. Yields are still
    attractive, although they have come down somewhat. The uncertainty brought
    on by deregulation will continue to be reduced, which should lower the
    perception of risk and bring about higher valuations. There is no reason
    that an electric distribution company should have a lower price/earnings
    ratio than a natural gas distribution company, which is currently the case.

    Telecommunications stocks generally had a very good year in 1997, and it is
    unlikely that this performance will be matched in 1998. Stocks in this
    sector are trading at historically peak valuations, with price/earnings
    ratios approaching those of the broader market. Revenue growth is likely to
    slow, especially if we see the slowing of the U.S. economy that many
    analysts predict. Although increasing competition has been a concern, we
    have seen little impact on stock prices so far. However, telecom stock
    valuations may be affected by competition in the coming year.

Q:  What do you foresee for the Fund's other investment sectors?

A:  Natural gas utilities should perform reasonably well in 1998, as the
    industry continues to consolidate, raising valuations and reducing the
    number of companies to invest in. I do not foresee much regulatory or
    competitive risk and may add to this sector during the seasonally weak
    second quarter. In foreign utilities, I will continue to focus on Europe and
    will probably add positions there. Also attractive are utilities in Latin
    America, where we currently have no exposure. We do not currently own
    utilities in Asia, and it is probably still early to invest there. I would
    like to see more economic stability first.

    Within the REIT sector, I see a potential risk of overbuilding which could
    reduce returns. The office sector is currently stable, especially in central
    business districts. As I mentioned, I will probably reduce the Fund's REIT
    holdings in 1998 and invest in sectors with higher growth potential.

                                       4
<PAGE>
 
EV Marathon Total Return Fund as of December 31, 1997

FUND PERFORMANCE

                  Comparison of Change in Value of a $10,000 
               Investment in EV Marathon Total Return Fund vs. 
                          the Standard & Poor's 500*

                  November 30, 1993 through December 31, 1997

                           [LINE GRAPH APPEARS HERE]

                           EV Marathon
                           Total Return
                Date          Fund         Fund w/CDSC**        S&P 500*
                ----          ----         -------------        -------

              11/30/93       $10,000          $13,450           $10,000
              12/31/93       $10,117          $13,450           $10,123
               1/31/94        $9,980          $13,450           $10,475
               2/28/94        $9,567          $13,450           $10,183
               3/31/94        $9,366          $13,450            $9,740
               4/30/94        $9,515          $13,450            $9,877
               5/31/94        $9,127          $13,450           $10,024
               6/30/94        $8,870          $13,450            $9,781
               7/31/94        $8,989          $13,450           $10,113
               8/31/94        $8,909          $13,450           $10,517
               9/30/94        $8,754          $13,450           $10,259
              10/31/94        $8,754          $13,450           $10,497
              11/30/94        $8,733          $13,450           $10,107
              12/31/94        $8,845          $13,450           $10,257
               1/31/95        $9,085          $13,450           $10,529
               2/28/95        $9,015          $13,450           $10,932
               3/31/95        $8,989          $13,450           $11,254
               4/30/95        $9,135          $13,450           $11,596
               5/31/95        $9,563          $13,450           $12,044
               6/30/95        $9,613          $13,450           $12,328
               7/31/95        $9,847          $13,450           $12,746
               8/31/95        $9,963          $13,450           $12,768
               9/30/95       $10,429          $13,450           $13,307
              10/31/95       $10,523          $13,450           $13,267
              11/30/95       $10,684          $13,450           $13,839
              12/31/95       $11,172          $13,450           $14,107
               1/31/96       $11,423          $13,450           $14,594
               2/28/96       $11,340          $13,450           $14,721
               3/31/96       $11,280          $13,450           $14,864
               4/30/96       $11,186          $13,450           $15,093
               5/31/96       $11,473          $13,450           $15,467
               6/30/96       $11,659          $13,450           $15,531
               7/31/96       $11,101          $13,450           $14,850
               8/31/96       $11,468          $13,450           $15,160
               9/30/96       $11,542          $13,450           $16,011
              10/31/96       $11,707          $13,450           $16,459
              11/30/96       $11,860          $13,450           $17,696
              12/31/96       $11,839          $13,450           $17,345
               1/31/97       $12,044          $13,450           $18,437
               2/28/97       $12,109          $13,450           $18,574
               3/31/97       $11,737          $13,450           $17,811
               4/30/97       $11,539          $13,450           $18,882
               5/31/97       $12,129          $13,450           $20,018
               6/30/97       $12,457          $13,450           $20,918
               7/31/97       $12,887          $13,450           $22,584
               8/31/97       $12,676          $13,450           $21,319
               9/30/97       $13,461          $13,450           $22,484
              10/31/97       $12,931          $13,450           $21,740
              11/30/97       $13,314          $13,450           $22,741
              12/31/97       $13,646          $13,450           $23,130

Performance+
- --------------------------------------------------------------------------------

Average Annual Total Returns (at net asset value)
- --------------------------------------------------------------------------------
One Year                                                           15.3%
Life of Fund (11/1/93)                                              7.3 

SEC Average Annual Total Returns (including applicable CDSC)
- --------------------------------------------------------------------------------
One Year                                                           10.5%
Life of Fund (11/1/93)                                              7.0 


*   Source: Towers Data Systems, Bethesda, MD. Investment operations commenced
    11/1/93. Index information is available only at month-end; therefore, the
    line comparison begins at the next month-end following the commencement of
    the Fund's investment operations.

    The chart compares the Fund's total return with that of the S&P 500 Index, a
    broad-based unmanaged index of 500 common stocks. Returns are calculated by
    determining the percentage change in net asset value with all distributions
    reinvested. The lines on the chart represent the total returns of $10,000
    hypothetical investments in the Fund and the S&P 500 Index. The Index's
    total return does not reflect any commissions or expenses that would have
    been incurred if an investor individually purchased or sold the securities
    represented in the Index. It is not possible to invest directly in an Index.

**  This figure represents the Fund's performance including the applicable
    contingent deferred sales charge (CDSC) based on the following schedule: 
    5% - 1st year; 5% - 2nd year; 4% - 3rd year; 3% - 4th year; 2% - 5th year; 
    1% - 6th year.

+   Returns are calculated by determining the percentage change in net asset
    value with all distributions reinvested. SEC returns reflect the Fund's
    applicable CDSC.

    Past performance is no guarantee of future results. Investment return and
    principal value will fluctuate so that shares, when redeemed, may be worth
    more or less than their original cost.

                                       5
<PAGE>
 
EV Marathon Total Return Fund as of December 31, 1997 

FINANCIAL STATEMENTS

Statement of Assets and Liabilities


As of December 31, 1997
Assets
- --------------------------------------------------------------------------------
Investment in Total Return Portfolio (Portfolio), at value
     (Note 1A) (identified cost, $35,006,994)                      $ 41,806,051
Receivable for Fund shares sold                                         510,757
Deferred organization expenses (Note 1D)                                 12,439
- --------------------------------------------------------------------------------
Total assets                                                       $ 42,329,247
- --------------------------------------------------------------------------------


Liabilities
- --------------------------------------------------------------------------------
Payable for Fund shares redeemed                                   $     47,940
Payable to affiliate for Trustees' fees (Note 4)                             40
Accrued expenses                                                         52,528
- --------------------------------------------------------------------------------
Total liabilities                                                  $    100,508
- --------------------------------------------------------------------------------
Net Assets for 4,365,046 shares of 
    beneficial interest outstanding                                $ 42,228,739
- --------------------------------------------------------------------------------


Sources of Net Assets
- --------------------------------------------------------------------------------
Paid-in capital                                                    $ 35,513,755
Accumulated distribution in excess of realized gain 
    (computed on the basis of identified cost)                         (150,503)
Accumulated undistributed net investment income                          66,430
Net unrealized appreciation of investments from Portfolio
    (computed on the basis of identified cost)                        6,799,057
- --------------------------------------------------------------------------------
Total                                                              $ 42,228,739
- --------------------------------------------------------------------------------


Net Asset Value, Offering and Redemption
Price Per Share (Note 6)
- --------------------------------------------------------------------------------
($42,228,739 / 4,365,046 shares of beneficial
    interest outstanding)                                          $       9.67
- --------------------------------------------------------------------------------


Statement of Operations


For the Year Ended
December 31, 1997
Investment Income (Note 1B)
- --------------------------------------------------------------------------------
Dividend income allocated from Portfolio (net of
    foreign taxes, $38,436)                                        $  1,942,785
Interest income allocated from Portfolio                                402,282
Expenses allocated from Portfolio                                      (339,820)
- --------------------------------------------------------------------------------
Net investment income from Portfolio                               $  2,005,247
- --------------------------------------------------------------------------------


Expenses
- --------------------------------------------------------------------------------
Compensation of Trustees not members of the
    Administrator's organization (Note 4)                          $        522
Distribution and service fees (Note 5)                                  432,092
Transfer and dividend disbursing agent fees                              52,803
Printing and postage                                                     34,158
Legal and accounting services                                            20,838
Registration fees                                                        17,417
Amortization of organization expenses (Note 1D)                           8,030
Custodian fee                                                             7,169
Miscellaneous                                                             9,587
- --------------------------------------------------------------------------------
Total expenses                                                     $    582,616
- --------------------------------------------------------------------------------

Net investment income                                              $  1,422,631
- --------------------------------------------------------------------------------


Realized and Unrealized
Gain (Loss) from Portfolio
- --------------------------------------------------------------------------------
Net realized gain (loss) --
     Investment transactions (identified cost basis)               $  3,914,537
     Foreign currency transactions                                         (638)
- --------------------------------------------------------------------------------
Net realized gain on investment transactions                       $  3,913,899
- --------------------------------------------------------------------------------

Change in unrealized appreciation (depreciation) --
     Investments                                                   $    935,480
     Foreign currency transactions                                          367
- --------------------------------------------------------------------------------
Net change in unrealized appreciation (depreciation) 
     of investments                                                $    935,847
- --------------------------------------------------------------------------------

Net realized and unrealized gain on investments                    $  4,849,746
- --------------------------------------------------------------------------------

Net increase in net assets from operations                         $  6,272,377
- --------------------------------------------------------------------------------

                       See notes to financial statements

                                       6
<PAGE>
 
EV Marathon Total Return Fund as of December 31, 1997

FINANCIAL STATEMENTS CONT'D 

Statements of Changes in Net Assets

<TABLE> 
<CAPTION> 

Increase (Decrease)                         Year Ended                Year Ended
in Net Assets                               December 31, 1997         December 31, 1996
- ----------------------------------------------------------------------------------------
<S>                                           <C>                       <C> 
From operations --
     Net investment income                    $     1,422,631           $     2,616,920
     Net realized gain on investments               3,913,899                 4,659,323
     Net change in unrealized
         appreciation (depreciation)
         of investments                               935,847                (4,070,053)
- ----------------------------------------------------------------------------------------
Net increase in net assets
     from operations                          $     6,272,377           $     3,206,190
- ----------------------------------------------------------------------------------------
Distributions to shareholders (Note 2) --
     From net investment income               $    (1,316,511)          $    (2,572,063)
     From net realized gain
         on investments                            (6,288,321)                 (353,305)
     In excess of net realized gain                  (252,187)                       --
- ----------------------------------------------------------------------------------------
Total distributions to shareholders           $    (7,857,019)          $    (2,925,368)
- ----------------------------------------------------------------------------------------
Transactions in shares of beneficial
     interest (Note 3) --
     Proceeds from sale of shares             $     2,511,320           $     6,358,519
     Net asset value of shares issued
         to shareholders in payment
         of distributions declared                  6,383,305                 2,258,766
     Cost of shares redeemed                      (15,731,354)              (16,488,942)
- ----------------------------------------------------------------------------------------
Net decrease in net assets from Fund
     share transactions                       $    (6,836,729)          $    (7,871,657)
- ----------------------------------------------------------------------------------------

Net decrease in net assets                    $    (8,421,371)          $    (7,590,835)
- ----------------------------------------------------------------------------------------


Net Assets
- ----------------------------------------------------------------------------------------
At beginning of year                          $    50,650,110           $    58,240,945
- ----------------------------------------------------------------------------------------
At end of year                                $    42,228,739           $    50,650,110
- ----------------------------------------------------------------------------------------


Accumulated undistributed net investment
income included in net assets
- ----------------------------------------------------------------------------------------
At end of year                                $        66,430           $        49,260
- ----------------------------------------------------------------------------------------
</TABLE> 

                       See notes to financial statements

                                       7
<PAGE>
 
EV Marathon Total Return Fund as of December 31, 1997

FINANCIAL STATEMENTS CONT'D 

Financial Highlights

<TABLE> 
<CAPTION> 
                                                                                    Year Ended December 31,
                                                              ----------------------------------------------------------------------
                                                                1997          1996          1995           1994         1993*
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                           <C>          <C>           <C>            <C>          <C> 
Net asset value -- Beginning of year                          $ 10.100     $ 10.070      $  8.300       $  9.930     $ 10.000
- ------------------------------------------------------------------------------------------------------------------------------------


Income (loss) from operations
- ------------------------------------------------------------------------------------------------------------------------------------
Net investment income                                          $  0.322     $  0.498      $  0.316       $  0.363     $  0.040
Net realized and unrealized gain (loss) on investments            1.099        0.091         1.817         (1.598)      (0.055)++
- ------------------------------------------------------------------------------------------------------------------------------------
Total income (loss) from operations                            $  1.421     $  0.589      $  2.133       $ (1.235)    $ (0.015)
- ------------------------------------------------------------------------------------------------------------------------------------


Less distributions
- ------------------------------------------------------------------------------------------------------------------------------------
From net investment income                                     $ (0.296)    $ (0.489)     $ (0.283)      $ (0.354)    $ (0.046)
In excess of net investment income                                  --           --         (0.080)           --           --
From net realized gain on investments                            (1.495)      (0.070)          --             --           --
In excess of net realized gain on investments                    (0.060)         --            --             --           --
From paid-in capital                                                --           --            --          (0.041)      (0.009)
- ------------------------------------------------------------------------------------------------------------------------------------
Total distributions                                            $ (1.851)    $ (0.559)     $ (0.363)      $ (0.395)    $ (0.055)
- ------------------------------------------------------------------------------------------------------------------------------------

Net asset value -- End of year                                 $  9.670     $ 10.100      $ 10.070       $  8.300     $  9.930
- ------------------------------------------------------------------------------------------------------------------------------------

Total Return/(1)/                                                 15.27%        5.97%        26.31%        (12.70)%      (0.15)%
- ------------------------------------------------------------------------------------------------------------------------------------


Ratios/Supplemental Data+++
- ------------------------------------------------------------------------------------------------------------------------------------
Net assets, end of year (000's omitted)                        $ 42,229     $ 50,650      $ 58,241       $ 26,210     $ 11,519
Ratio of net expenses to average daily net assets/(2)/             2.04%        2.05%         2.11%          2.07%        0.68%+
Ratio of net investment income to average daily net assets         3.15%        4.77%         3.37%          3.95%        3.38%+
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE> 

+++  The operating expenses of the Fund may reflect an allocation of expenses to
     the Administrator. Had such action not been taken, the ratios would have
     been as follows:

<TABLE> 
<CAPTION> 

Ratios (As a percentage of average daily net assets):
     <S>                                                             <C>          <C>           <C>            <C>        <C> 
     Expenses/(2)/                                                   --           --            --             --         1.83%+
     Net investment income                                           --           --            --             --         2.23%+
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE> 

+      Annualized.

++     The per share amount is not in accordance with the net realized and
       unrealized gain (loss) for the period because of the timing of sales of
       Fund shares and the amount of the per share realized and unrealized gains
       and losses at such time.

*      For the period from the start of business, November 1, 1993 to December
       31, 1993.

/(1)/  Total investment return is calculated assuming a purchase at the net
       asset value on the first day and a sale at the net asset value on the
       last day of each period reported. Dividends and distributions, if any,
       are assumed to be reinvested at the net asset value on the ex-dividend
       date. Total return is not computed on an annualized basis.

/(2)/  Includes the Fund's share of its corresponding Portfolio's allocated
       expenses.

                       See notes to financial statements

                                       8
<PAGE>
 
EV Marathon Total Return Fund as of December 31, 1997

NOTES TO FINANCIAL STATEMENTS


1  Significant Accounting Policies
   ----------------------------------------------------------------------------
   EV Marathon Total Return Fund (the Fund), is a non-diversified entity of the
   type commonly known as a Massachusetts business trust and is registered under
   the Investment Company Act of 1940, as amended, as an open-end, management
   investment company. The Fund is a series in the Eaton Vance Special
   Investment Trust (the Trust). The Fund invests all of its investable assets
   in interests in the Total Return Portfolio (the Portfolio), a New York Trust,
   having the same investment objective as the Fund. The value of the Fund's
   investment in the Portfolio reflects the Fund's proportionate interest in the
   net assets of the Portfolio (10.1% at December 31, 1997). The performance of
   the Fund is directly affected by the performance of the Portfolio. The
   financial statements of the Portfolio, including the portfolio of
   investments, are included elsewhere in this report and should be read in
   conjunction with the Fund's financial statements. The following is a summary
   of significant accounting policies consistently followed by the Fund in the
   preparation of its financial statements. The policies are in conformity with
   generally accepted accounting principles.

   On June 23, 1997, the Board of Trustees approved a Plan of Reorganization
   (the "Plan") for the Trust. Under the terms of the Plan, the EV Traditional
   Total Return Fund (the Successor Fund), a separate series of the Trust, would
   acquire substantially all of the assets and liabilities of the Fund (the
   Acquired Fund). The transaction will be structured for tax purposes to
   qualify as a tax-free reorganization under the Internal Revenue Code. The
   Trust will issue and deliver to the Acquired Fund a number of full and
   fractional shares of beneficial interest of a separate class of the Successor
   Fund (Class B shares), which will be equal in value to the net asset value
   per share of the Acquired Fund then outstanding. Such transaction will occur
   after the close of business, on December 31, 1997.

   Effective January 1, 1998, the EV Traditional Total Return Fund changed its
   name to the Eaton Vance Total Return Fund.

   A Investment Valuations -- Valuation of securities by the Portfolio is
   discussed in Note 1A of the Portfolio's Notes to Financial Statements which
   are included elsewhere in this report.

   B Income -- The Fund's net investment income consists of the Fund's pro
   rata share of the net investment income of the Portfolio, less all actual
   and accrued expenses of the Fund.

   C Federal Taxes -- The Fund's policy is to comply with the provisions of the
   Internal Revenue Code applicable to regulated investment companies and to
   distribute to shareholders each year all of its taxable income, including any
   net realized gain on investments. Accordingly, no provision for federal
   income or excise tax is necessary. Pursuant to Section 852 of the Internal
   Revenue Code, the Fund designates $3,638,355 at 28% and $2,896,692 at 20%, as
   long-term capital gain distributions for its taxable year ended December 31,
   1997.

   D Deferred Organization Expenses -- Costs incurred by the Fund in connection
   with its organization are being amortized on the straight-line basis over
   five years.

   E Expense Reduction -- Investors Bank & Trust Company (IBT) serves as
   custodian to the Fund. Pursuant to the custodian agreement, IBT receives a
   fee reduced by credits which are determined based on the average daily cash
   balances the Fund maintains with IBT. All significant credit balances used to
   reduce the Fund's custodian fees are reflected as a reduction of operating
   expenses on the Statement of Operations.

   F Other -- Investment transactions are accounted for on a trade date basis.

   G Use of Estimates -- The preparation of financial statements in conformity
   with generally accepted accounting principles requires management to make
   estimates and assumptions that affect the reported amounts of assets and
   liabilities at the date of the financial statements and the reported amounts
   of revenue and expense during the reporting period. Actual results could
   differ from those estimates.


2  Distributions to Shareholders
   ----------------------------------------------------------------------------
   The Fund's policy is to distribute monthly substantially all of the net
   investment income allocated to the Fund by the Portfolio (less the Fund's
   direct expenses) and to distribute at least annually substantially all of its
   net realized capital gains. Distributions are paid in the form of additional
   shares of the Fund or, at the election of the shareholder, in cash. The Fund
   distinguishes between distributions on a

                                       9
<PAGE>
 
EV Marathon Total Return Fund as of December 31, 1997 

NOTES TO FINANCIAL STATEMENTS CONT'D


   tax basis and a financial reporting basis. Generally accepted accounting
   principles require that only distributions in excess of tax basis earnings
   and profits be reported in the financial statements as a return of capital.
   Differences in the recognition or classification of income between the
   financial statements and tax earnings and profits which result in over
   distributions only for financial statement purposes are classified as
   distributions in excess of net investment income or net realized gain on
   investments. Permanent differences between book and tax accounting relating
   to distributions are reclassified to paid-in capital.


3  Shares of Beneficial Interest
   ----------------------------------------------------------------------------
   The Fund's Declaration of Trust permits the Trustees to issue an unlimited
   number of full and fractional shares of beneficial interest (without par
   value). Transactions in Fund shares were as follows:

                                                          Year Ended
                                                         December 31,
                                               --------------------------------
                                                     1997            1996
   ----------------------------------------------------------------------------
   Sales                                           249,200          626,317
   Issued to shareholders electing to              
    receive payments of distributions in
    Fund shares                                    665,132          223,945
   Redemptions                                  (1,562,433)      (1,623,468)
   ----------------------------------------------------------------------------
   Net decrease                                   (648,101)        (773,206)
   ----------------------------------------------------------------------------


4  Transactions with Affiliates
   ----------------------------------------------------------------------------
   Eaton Vance Management (EVM) serves as the administrator of the Fund, but
   receives no compensation. The Portfolio has engaged Boston Management and
   Research (BMR), a subsidiary of EVM, to render investment advisory services.
   See Note 2 of the Portfolio's Notes to Financial Statements which are
   included elsewhere in this report.

   Except as to Trustees of the Fund and the Portfolio who are not members of
   EVM's and BMR's organization, officers and Trustees receive remuneration for
   their services to the Fund out of the investment adviser fee earned by BMR.
   Certain of the officers and Trustees of the Fund and the Portfolio are
   officers and directors/trustees of the above organizations.


5  Distribution Plan
   ----------------------------------------------------------------------------
   The Fund has adopted a Distribution Plan (the Plan) pursuant to Rule 12b-1
   under the Investment Company Act of 1940. The Plan requires the Fund to pay
   the principal underwriter, Eaton Vance Distributors, Inc. (EVD), amounts
   equal to 1/365 of 0.75% of the Fund's daily net assets, for providing ongoing
   distribution services and facilities to the Fund. The Fund will automatically
   discontinue payments to EVD during any period in which there are no
   outstanding Uncovered Distribution Charges, which are approximately
   equivalent to the sum of (i) 5% of the aggregate amount received by the Fund
   for shares sold plus, (ii) distribution fees calculated by applying the rate
   of 1% over the prevailing prime rate to the outstanding balance of Uncovered
   Distribution Charges of EVD, reduced by the aggregate amount of contingent
   deferred sales charges (see Note 6) and amounts theretofore paid to EVD.

   The amount payable to EVD with respect to each day is accrued on such day as
   a liability of the Fund and, accordingly, reduces the Fund's net assets. Such
   payments would cease upon termination of the distribution agreement (unless
   made in accordance with another distribution agreement). As a result, the
   Fund does not accrue amounts which may become payable to EVD in the future
   because the conditions for recording any contingent liability under generally
   accepted accounting principles have not been satisfied. EVD earned $338,434
   for the year ended December 31, 1997, representing 0.75% of average daily net
   assets. At December 31, 1997, the amount of Uncovered Distribution Charges of
   EVD calculated under the Plan was approximately $648,000.

   In addition, the Plan authorizes the Fund to make payments of service fees to
   the Principal Underwriter, Authorized Firms and other persons in amounts not
   exceeding 0.25% of the Fund's average daily net assets for each fiscal year.
   The Trustees have implemented the Plan by authorizing the Fund to make
   quarterly payments of service fees to the Principal Underwriter and
   Authorized Firms in amounts not expected to exceed 0.25% of the Fund's
   average daily net assets for each fiscal year based on the value of Fund
   shares sold by such persons and remaining outstanding for at least twelve
   months. During the year ended December 31, 1997, the Fund provided $93,658
   under the Plan to the Principal Underwriter and Authorized Firms. Service
   fees are separate and distinct from the sales commissions and distribution
   fees payable by the Fund to EVD, and, as such, are not subject to automatic
   discontinuance when there are no outstanding Uncovered Distribution Charges
   of EVD.

                                       10
<PAGE>
 
EV Marathon Total Return Fund as of December 31, 1997 

NOTES TO FINANCIAL STATEMENTS CONT'D


   Certain of the officers of the Fund and Directors of the Corporation are
   officers or directors of EVD.


6  Contingent Deferred Sales Charge
   ----------------------------------------------------------------------------
   A contingent deferred sales charge (CDSC) is imposed on any redemption of
   Fund shares made within six years of purchase. Generally, the CDSC is based
   upon the lower of the net asset value at date of redemption or date of
   purchase. No charge is levied on shares acquired by reinvestment of dividends
   or capital gains distributions. For Fund shares purchased prior to August 1,
   1994, the CDSC was imposed at declining rates that begin at 6% in the first
   year of redemption after purchase, declining one percentage point each year.
   For Fund shares purchased on or after August 1, 1994, the CDSC will be
   imposed at declining rates beginning at 5% in the first and second years of
   redemption after purchase, declining one percentage point in each subsequent
   year. No CDSC is levied on shares which have been sold to EVM or its
   affiliates or to their respective employees or clients. CDSC charges are paid
   to EVD to reduce the amount of Uncovered Distribution Charges calculated
   under the Fund's Distribution Plan. CDSC charges received when no Uncovered
   Distribution Charges exist will be credited to the Fund. EVD received
   approximately $175,000 of CDSC paid by shareholders for the year ended
   December 31, 1997.


7  Investment Transactions
   ----------------------------------------------------------------------------
   Increases and decreases in the Fund's investment in the Portfolio for the
   year ended December 31, 1997, aggregated $2,980,789 and $17,852,070,
   respectively.

                                       11
<PAGE>
 
EV Marathon Total Return Fund as of December 31, 1997

INDEPENDENT ACCOUNTANTS' REPORT


To the Shareholders and Board of Trustees of EV Marathon Total Return Fund, a
series of Eaton Vance Special Investment Trust:
- -------------------------------------------------------------------------------
We have audited the accompanying statement of assets and liabilities of EV
Marathon Total Return Fund (the Fund), a series of Eaton Vance Special
Investment Trust, as of December 31, 1997, and the related statement of
operations for the year then ended, the statements of changes in net assets for
each of the two years in the period then ended and the financial highlights for
each of the four years in the period then ended and for the period from November
1, 1993 (start of business) to December 31, 1993. These financial statements and
financial highlights are the responsibility of the Fund's management. Our
responsibility is to express an opinion on these financial statements and
financial highlights based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements and financial
highlights are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. An audit also includes assessing the accounting principles used and
significant estimates made by management, as well as evaluating the overall
financial statement presentation. We believe that our audits provide a
reasonable basis for our opinion. 

In our opinion, the financial statements and financial highlights referred to
above present fairly, in all material respects, the financial position of the
Fund, a series of Eaton Vance Special Investment Trust, as of December 31, 1997,
and the results of its operations for the year then ended, the changes in its
net assets for each of the two years in the period then ended and the financial
highlights for each of the four years in the period then ended and for the
period from November 1, 1993 (start of business) to December 31, 1993, in
conformity with generally accepted accounting principles.

                                                COOPERS & LYBRAND L.L.P.
                                                Boston, Massachusetts
                                                February 6, 1998

                                      12
<PAGE>
 
Total Return Portfolio as of December 31, 1997

PORTFOLIO OF INVESTMENTS


Common Stocks -- 86.7%


Security                                          Shares        Value
- --------------------------------------------------------------------------------

Broadcasting and Cable -- 0.5%
- --------------------------------------------------------------------------------
Ovation, Inc.*++                                   238,168      $     1,981,558
- --------------------------------------------------------------------------------
                                                                $     1,981,558
- --------------------------------------------------------------------------------

Electric Utilities -- 29.2%
- --------------------------------------------------------------------------------
Central Louisiana Electric Co.                     210,000      $     6,798,750
Cilcorp, Inc.                                      130,000            6,353,750
DPL, Inc.                                          500,000           14,375,001
DQE, Inc.                                          450,000           15,806,251
Electric de Portugal ADR*                           20,000              775,000
Endesa S.A. ADR                                    200,000            3,637,500
LG & E Energy Corp.                                  6,500              160,875
Long Island Lighting Co.                           175,000            5,271,875
National Grid Holdings                           2,875,000           13,730,001
NIPSCO Industries, Inc.                            325,000           16,067,189
Pinnacle West Capital Corp.                        350,000           14,831,251
PowerGen PLC                                     1,000,000           13,080,901
Sierra Pacific Resources                           150,000            5,625,000
Southern Electric                                  500,000            3,998,300
United Utilities PLC                                 7,807              100,838
- --------------------------------------------------------------------------------
                                                                $   120,612,482
- --------------------------------------------------------------------------------

Natural Gas Utilities -- 3.9%
- --------------------------------------------------------------------------------
K N Energy                                         300,000      $    16,200,001
- --------------------------------------------------------------------------------
                                                                $    16,200,001
- --------------------------------------------------------------------------------

Oil and  Gas - Equipment and Services -- 2.1%
- --------------------------------------------------------------------------------
Diamond Offshore Drilling, Inc.                    180,000      $     8,662,500
- --------------------------------------------------------------------------------
                                                                $     8,662,500
- --------------------------------------------------------------------------------

Oil and  Gas - Exploration and Production -- 2.9%
- --------------------------------------------------------------------------------
Coho Energy Inc.*                                  150,000      $     1,368,750
EEX Corporation*                                   800,000            7,250,000
Louis Dreyfus Natural Gas*                         180,000            3,363,750
- --------------------------------------------------------------------------------
                                                                $    11,982,500
- --------------------------------------------------------------------------------

REITS -- 23.4%
- --------------------------------------------------------------------------------
Annaly Mortgage, Inc., 144A                        350,000      $     3,828,125
Criimi Mae, Inc.                                   650,000            9,750,000
Equity Office Properties                           150,415            4,747,473
Excel Realty Trust, Inc.                           125,000            3,937,500
First Union Real Estate                             50,000              812,500
Hanover Capital Mortgage                            50,000              825,000
Imperial Credit Commercial
   Mortgage Investment                             150,000            2,193,750
Mack-Cali Realty Corp.                             300,000           12,300,001
Ocwen Asset Investment Corp.                       400,000            8,200,000
Parkway Properties Inc.                            175,000            6,004,688
Prime Group Realty Trust                           290,000            5,872,500
Prime Retail, Inc.                                 250,000            3,546,875
Security Capital US Realty Trust*                  600,000            8,520,000
Sunstone Hotel Investors, Inc.                     525,000            9,056,250
Tower Realty Trust, Inc.                           300,000            7,387,500
Vornado Realty Trust                               210,000            9,856,876
- --------------------------------------------------------------------------------
                                                                $    96,839,038
- --------------------------------------------------------------------------------

Telephone Utilities -- 24.7%
- --------------------------------------------------------------------------------
ACC Corp.*                                         300,000      $    15,150,001
Bell Atlantic Corp.                                100,000            9,100,000
BellSouth Corp.                                    375,000           21,117,189
Energis*                                         4,050,000           16,926,166
GTE Corp.                                          100,000            5,225,000
MCI Communications Corp.                           250,000           10,703,126
Metronet Communications*                           100,000            1,737,500
Nextlink Communications*                            26,000              554,125
SBC Communications, Inc.                           250,000           18,312,501
Tel Save Holdings, Inc.*                            50,000              993,750
Trescom International, Inc.*                       335,000            2,491,563
- --------------------------------------------------------------------------------
                                                                $   102,310,921
- --------------------------------------------------------------------------------

Total Common Stocks
     (identified cost $290,500,017)                             $   358,589,000
- --------------------------------------------------------------------------------

Convertible Preferred Stocks -- 7.6%


Business Services - Miscellaneous -- 0.7%
- --------------------------------------------------------------------------------
Newell Financial Trust*                             50,000      $     2,612,500
- --------------------------------------------------------------------------------
                                                                $     2,612,500
- --------------------------------------------------------------------------------

REITS -- 4.4%
- --------------------------------------------------------------------------------
Excel Realty                                       375,000      $    11,378,889
Vornado Realty Trust                                40,000            2,640,000


                       See notes to financial statements

                                      13
<PAGE>
 
Total Return Portfolio as of December 31, 1997

PORTFOLIO OF INVESTMENTS CONT'D




Security                                       Shares           Value
- --------------------------------------------------------------------------------

REITS (continued)
- --------------------------------------------------------------------------------
Walden Residential                                 140,000      $     4,130,000
- --------------------------------------------------------------------------------
                                                                $    18,148,889
- --------------------------------------------------------------------------------

Telephone Utilities -- 2.5%
- --------------------------------------------------------------------------------
Intermedia Communications, Inc.                     25,000      $       950,000
Intermedia Communications, Inc., 144A*             250,000            9,500,000
- --------------------------------------------------------------------------------
                                                                $    10,450,000
- --------------------------------------------------------------------------------

Total Convertible Preferred Stocks
     (identified cost $24,737,650)                              $    31,211,389
- --------------------------------------------------------------------------------

Warrants -- 0.1%

REITS -- 0.1%
- --------------------------------------------------------------------------------
Walden Residential Warrants*                       340,000      $       425,000
- --------------------------------------------------------------------------------
                                                                $       425,000
- --------------------------------------------------------------------------------

Total Warrants
     (identified cost $0)                                       $       425,000
- --------------------------------------------------------------------------------


Convertible Bonds -- 6.9%


                                             Principal
                                             Amount
Security                                     (000's omitted)    Value
- --------------------------------------------------------------------------------
Loews Corp., 3.125%, 9/15/07                     $  10,000      $     9,813,001
Midcom Communications, 144A,
   8.25%, 8/15/03+                                  10,000            3,100,000
Ovation, Inc., 9.75%, 2/23/01++                      2,000            1,800,000
SA Telecommunications, 10.00%, 8/15/06+              3,000            1,050,000
Smartalk Teleservices, 144A, 5.75%, 9/15/04         12,000           12,772,501
- --------------------------------------------------------------------------------

Total Convertible Bonds
     (identified cost $37,862,169)                              $    28,535,502
- --------------------------------------------------------------------------------

Corporate Bonds -- 3.2%

                                             Principal
                                             Amount
Security                                     (000's omitted)    Value
- --------------------------------------------------------------------------------
Bank Plus Corp., 12.00%, 7/18/07                 $  10,625      $    11,953,126
Orbital Sciences, 144A, 5.00%, 10/1/02               1,000            1,281,250
- --------------------------------------------------------------------------------


Total Corporate Bonds
     (identified cost $12,018,750)                              $    13,234,376
- --------------------------------------------------------------------------------

Commercial Paper -- 1.2%
                                             Principal
                                             Amount
Security                                     (000's omitted)    Value
- --------------------------------------------------------------------------------
Associates Corp., N.A., 6.70%, 1/2/98            $   5,167      $     5,166,038
- --------------------------------------------------------------------------------

Total Commercial Paper
     (amortized cost $5,166,038)                                $     5,166,038
- --------------------------------------------------------------------------------

Total Investments -- 105.7%
     (identified cost $370,284,624)                             $   437,161,305
- --------------------------------------------------------------------------------

Other Assets, Less Liabilities -- (5.7)%                        $   (23,752,406)
- --------------------------------------------------------------------------------

Net Assets -- 100%                                              $   413,408,899
- --------------------------------------------------------------------------------


*    Non-income producing security.
+    The issuer has filed for chapter 11 bankruptcy.
++   Valued in good faith at fair value using procedures approved by the board
     of directors (see note 1 of Notes to Financial Statements).




                       See notes to financial statements

                                      14
<PAGE>
 
Total Return Portfolio as of December 31, 1997

FINANCIAL STATEMENTS

Statement of Assets and Liabilities

As of December 31, 1997
Assets
- --------------------------------------------------------------------------------
Investments, at value (Note 1A) (identified cost,         
     $370,284,624)                                             $   437,161,305
Cash                                                                     2,897
Dividends and interest receivable                                    2,695,749
Miscellaneous receivable                                                15,213
Tax reclaim receivable                                                  24,608
Deferred organization expenses (Note 1I)                                 2,592
- --------------------------------------------------------------------------------
Total assets                                                   $   439,902,364
- --------------------------------------------------------------------------------
                                                        
                                                        
Liabilities                                             
- --------------------------------------------------------------------------------
Payable for investments purchased                              $    26,418,623
Payable to affiliate for Trustees' fees (Note 2)                         4,700
Accrued expenses                                                        70,142
- --------------------------------------------------------------------------------
Total liabilities                                              $    26,493,465
- --------------------------------------------------------------------------------
Net Assets applicable to investors'                     
     interest in Portfolio                                     $   413,408,899
- --------------------------------------------------------------------------------
                                                        
                                                        
Sources of Net Assets                                   
- --------------------------------------------------------------------------------
Net proceeds from capital contributions and withdrawals        $   346,511,992
Net unrealized appreciation of investments (computed on 
     the basis of identified cost)                                  66,896,907
- --------------------------------------------------------------------------------
Total                                                          $   413,408,899
- --------------------------------------------------------------------------------

                                                        
Statement of Operations                                 
                                                        
For the Year Ended                                      
December 31, 1997                                       
Investment Income (Note 1B)                             
- --------------------------------------------------------------------------------
Dividends (net of foreign taxes, $369,852)                     $    18,358,463
Interest income                                                      3,800,498
- --------------------------------------------------------------------------------
Total income                                                   $    22,158,961
- --------------------------------------------------------------------------------
                                                        
                                                        
Expenses                                                
- --------------------------------------------------------------------------------
Investment adviser fee (Note 2)                                $     2,839,559
Compensation of Trustees not members of the             
     Investment Adviser's organization (Note 2)                         14,929
Custodian fee                                                          222,143
Legal and accounting services                                           55,601
Amortization of organization expenses (Note 1I)                          5,029
Miscellaneous                                                           78,065
- --------------------------------------------------------------------------------
Total expenses                                                 $     3,215,326
- --------------------------------------------------------------------------------

Net investment income                                          $    18,943,635
- --------------------------------------------------------------------------------
                                                       
                                                       
Realized and Unrealized                                
Gain (Loss) on Investments                             
- --------------------------------------------------------------------------------
Net realized gain (loss) --                            
     Investment transactions (identified cost basis)            $    34,492,215
     Foreign currency transactions                                       (6,190)
- --------------------------------------------------------------------------------
Net realized gain on investment transactions                    $    34,486,025
- --------------------------------------------------------------------------------
Change in unrealized appreciation (depreciation) --    
     Investments (identified cost basis)                        $    11,999,383
     Foreign currency transactions                                        5,521
- --------------------------------------------------------------------------------
Net change in unrealized appreciation (depreciation)
     of investments                                             $    12,004,904
- --------------------------------------------------------------------------------

Net realized and unrealized gain on investments                 $    46,490,929
- --------------------------------------------------------------------------------
                                                       
Net increase in net assets from operations                      $    65,434,564
- --------------------------------------------------------------------------------

                       See notes to financial statements

                                      15
<PAGE>
 
Total Return Portfolio as of December 31, 1997

FINANCIAL STATEMENTS CONT'D

Statements of Changes in Net Assets


Increase (Decrease)                    Year Ended            Year Ended
in Net Assets                          December 31, 1997     December 31, 1996
- -------------------------------------------------------------------------------
From operations --
     Net investment income               $    18,943,635      $     29,247,918
     Net realized gain on investments         34,486,025            46,868,346
     Net change in unrealized
         appreciation (depreciation)
         of investments                       12,004,904           (41,698,849)
- -------------------------------------------------------------------------------
Net increase in net assets
     from operations                     $    65,434,564      $     34,417,415
- -------------------------------------------------------------------------------
Capital transactions --
     Contributions                       $    47,969,480      $     18,255,080
     Withdrawals                            (155,062,140)         (119,275,825)
- -------------------------------------------------------------------------------
Net decrease in net assets from
     capital transactions                $  (107,092,660)     $   (101,020,745)
- -------------------------------------------------------------------------------

Net decrease in net assets               $   (41,658,096)     $    (66,603,330)
- -------------------------------------------------------------------------------


Net Assets
- -------------------------------------------------------------------------------
At beginning of year                     $   455,066,995      $    521,670,325
- -------------------------------------------------------------------------------
At end of year                           $   413,408,899      $    455,066,995
- -------------------------------------------------------------------------------

                       See notes to financial statements

                                      16
<PAGE>
 
Total Return Portfolio as of December 31, 1997

FINANCIAL STATEMENTS CONT'D

Supplementary Data

<TABLE> 
<CAPTION> 
                                                                                Year Ended December 31,
                                                       ----------------------------------------------------------------------
                                                         1997            1996           1995           1994           1993*
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                                 <C>             <C>           <C>            <C>             <C> 

Ratios to average daily net assets
- -----------------------------------------------------------------------------------------------------------------------------
Expenses                                                  0.75%           0.85%          0.84%         0.85%           0.91%+
Net investment income                                     4.42%           5.94%          4.83%         5.22%           4.57%+
Portfolio Turnover                                         169%            166%           103%          107%             16%
- -----------------------------------------------------------------------------------------------------------------------------
Average commission rate (per share)/(1)/            $   0.0429      $   0.0374    $       --     $       --      $       --
- -----------------------------------------------------------------------------------------------------------------------------


Leverage Analysis:
- -----------------------------------------------------------------------------------------------------------------------------
Average daily balance of debt outstanding during
     period (000's omitted)                         $      922      $      217    $       232    $    3,137      $   15,452
- -----------------------------------------------------------------------------------------------------------------------------
Net assets, end of period (000's omitted)           $  413,409      $  455,067    $   521,670    $  505,567      $  636,567
- -----------------------------------------------------------------------------------------------------------------------------
</TABLE> 

+     Annualized.

*     For the period from the start of business, October 28, 1993 to December
      31, 1993.

/(1)/ Average commission rate paid is computed by dividing the total dollar
      amount of commissions paid during the period by the total number of shares
      purchased and sold during the period for which commissions were charged.
      For fiscal years beginning on or after September 1, 1995, a Fund is
      required to disclose its average commission rate per share for security
      trades on which commissions were charged.

                       See notes to financial statements

                                      17

<PAGE>
 
Total Return Portfolio as of December 31, 1997

NOTES TO FINANCIAL STATEMENTS


1  Significant Accounting Policies
   -----------------------------------------------------------------------------
   Total Return Portfolio (the Portfolio) is registered under the Investment
   Company Act of 1940 as a diversified open-end management investment company
   which was organized as a trust under the laws of the State of New York on May
   1, 1992. The Declaration of Trust permits the Trustees to issue beneficial
   interests in the Portfolio. The following is a summary of significant
   accounting policies of the Portfolio. The policies are in conformity with
   generally accepted accounting principles.

   A Investment Valuations -- Securities listed on securities exchanges or in
   the NASDAQ National Market are valued at closing sales prices or, if there
   has been no sale, at the mean between the closing bid and asked prices.
   Unlisted securities are valued at the mean between the latest available bid
   and asked prices. Options and financial futures contracts are valued at the
   last sale price, as quoted on the principal exchange or board of trade on
   which such options or contracts are traded or, in the absence of a sale, the
   mean between the last bid and asked prices. Short-term obligations, maturing
   in 60 days or less, are valued at amortized cost, which approximates value.
   Other fixed income and debt securities, including listed securities and
   securities for which price quotations are available, will normally be valued
   on the basis of valuations furnished by a pricing service. Securities for
   which market quotations are unavailable are appraised at their fair value as
   determined in good faith by or at the direction of the Trustees.

   B Income -- Interest income is determined on the basis of interest accrued,
   adjusted for amortization of premium or discount when required for federal
   income tax purposes. Dividend income is recorded on the ex-dividend date for
   dividends received in cash and/or securities. However, if the ex-dividend
   date has passed, certain dividends from foreign securities are recorded as
   the Portfolio is informed of the ex-dividend date.

   C Income Taxes -- The Portfolio is treated as a partnership for federal tax
   purposes. No provision is made by the Portfolio for federal or state taxes on
   any taxable income of the Portfolio because each investor in the Portfolio is
   ultimately responsible for the payment of any taxes. Since some of the
   Portfolio's investors are regulated investment companies that invest all or
   substantially all of their assets in the Portfolio, the Portfolio normally
   must satisfy the applicable source of income and diversification
   requirements (under the Code) in order for its investors to satisfy them. The
   Portfolio will allocate at least annually among its investors each investor's
   distributive share of the Portfolio's net investment income, net realized
   capital gains, and any other items of income, gain, loss, deduction or
   credit.

   D Foreign Currency Translation -- Investment valuations, other assets, and
   liabilities initially expressed in foreign currencies are converted each
   business day into U.S. dollars based upon current exchange rates. Purchases
   and sales of foreign investment securities and income and expenses are
   converted into U.S. dollars based upon currency exchange rates prevailing on
   the respective dates of such transactions. Recognized gains or losses on
   investment transactions attributable to foreign currency rates are recorded
   for financial statement purposes as net realized gains and losses on
   investments. That portion of unrealized gains and losses on investments that
   result from fluctuations in foreign currency exchange rates are not
   separately disclosed.

   E Expense Reduction -- Investors Bank & Trust Company (IBT) serves as
   custodian of the Portfolio. Pursuant to the custodian agreement, IBT receives
   a fee reduced by credits which are based on the average daily cash balances
   the Portfolio maintains with IBT. All significant credit balances used to
   reduce the Portfolio's custodian fees are reported as a reduction of expenses
   on the Statement of Operations.

   F Option Accounting Principles -- Upon the writing of a covered call option,
   an amount equal to the premium received by the Portfolio is included in the
   Statement of Assets and Liabilities as a liability. The amount of the
   liability is subsequently marked-to-market to reflect the current market
   value of the option written in accordance with the Portfolio's policies on
   investment valuations discussed above. Premiums received from writing call
   options which expire are treated as realized gains. Premiums received from
   writing call options which are exercised or are closed are added to or offset
   against the proceeds or amount paid on the transaction to determine the
   realized gain or loss. The Portfolio, as writer of a call option, may have no
   control over whether the underlying securities may be sold and, as a result,
   bears the market risk for an unfavorable change in the price of the
   securities underlying the written option.

                                       18
<PAGE>
 
Total Return Portfolio as of December 31, 1997

NOTES TO FINANCIAL STATEMENTS CONT'D


   G Financial Futures Contracts -- Upon the entering of a financial futures
   contract, the Portfolio is required to deposit an amount ("initial margin")
   either in cash or securities equal to a certain percentage of the purchase
   price indicated in the financial futures contract. Subsequent payments are
   made or received by the Portfolio ("margin maintenance") each day, dependent
   on the daily fluctuations in the value of the underlying security, and are
   recorded for book purposes as unrealized gains or losses by the Portfolio.
   When the Portfolio enters into a closing transaction, the Portfolio will
   realize for book purposes a gain or loss equal to the difference between the
   value of the financial futures contract to sell and the financial futures
   contract to buy. The Portfolio's investment in financial futures contracts is
   designed only to hedge against anticipated future changes in interest rates,
   security prices, commodity prices or currency exchange rates. Should interest
   rates, security prices, commodity prices or currency exchange rates move
   unexpectedly, the Portfolio may not achieve the anticipated benefits of the
   financial futures contracts and may realize a loss.

   H Delayed Delivery Transactions -- The Portfolio may purchase or sell
   securities on a when-issued or forward commitment basis. Payment and delivery
   may take place at a period in time after the date of the transaction. At the
   time the transaction is negotiated, the price of the security that will be
   delivered and paid for are fixed. Losses may arise due to changes in the
   market value of the underlying securities if the counterparty does not
   perform under the contract.

   I Deferred Organization Expenses -- Costs incurred by the Portfolio in
   connection with its organization are being amortized on the straight-line
   basis over five years.

   J Other -- Investment transactions are accounted for on a trade date basis.

   K Use of Estimates -- The preparation of the financial statements in
   conformity with generally accepted accounting principles requires management
   to make estimates and assumptions that affect the reported amounts of assets
   and liabilities at the date of the financial statements and the reported
   amounts of revenue and expense during the reporting period. Actual results
   could differ from those estimates.


2  Investment Adviser Fee and Other Transactions with Affiliates
   ----------------------------------------------------------------------------
   The investment adviser fee is earned by Boston Management and Research (BMR),
   a wholly-owned subsidiary of Eaton Vance Management (EVM), as compensation
   for management and investment advisory services rendered to the Portfolio.
   The fee is based upon a percentage of average daily net assets. For the year
   ended December 31, 1997, the fee was equivalent to 0.66% of the Portfolio's
   average net assets for such period and amounted to $2,839,559. Except as to
   Trustees of the Portfolio who are not members of EVM's or BMR's organization,
   officers and Trustees receive remuneration for their services to the
   Portfolio out of such investment adviser fee. Certain of the officers and
   Trustees of the Portfolio are officers and directors/trustees of the above
   organizations. Trustees of the Portfolio that are not affiliated with the
   Investment Adviser may elect to defer receipt of all or a percentage of their
   annual fees in accordance with the terms of the Trustees Deferred
   Compensation Plan. For the year ended December 31, 1997, no significant
   amounts have been deferred.


3  Investment Transactions
   ----------------------------------------------------------------------------
   Purchases and sales of investments, other than short-term obligations,
   aggregated $704,111,417 and $772,863,330, respectively.


4  Federal Income Tax Basis of Investments
   ----------------------------------------------------------------------------
   The cost and unrealized appreciation/depreciation in value of the investments
   owned at December 31, 1997, as computed on a federal income tax basis, were
   as follows:


   Aggregate cost                       $373,101,094
   --------------------------------------------------
   Gross unrealized appreciation        $ 81,033,066

   Gross unrealized depreciation         (16,972,855)
   --------------------------------------------------

   Net unrealized appreciation          $ 64,060,211
   --------------------------------------------------

                                       19
<PAGE>
 
Total Return Portfolio as of December 31, 1997

NOTES TO FINANCIAL STATEMENTS CONT'D


5  Line of Credit
   ----------------------------------------------------------------------------
   The Portfolio participates with other portfolios and funds managed by BMR and
   EVM and its affiliates in a $100 million unsecured line of credit agreement
   with a group of banks. The Portfolio may temporarily borrow from the line of
   credit to satisfy redemption requests or settle investment transactions.
   Interest is charged to each portfolio or fund based on its borrowings at an
   amount above the eurodollar rate or federal funds rate. In addition, a fee
   computed at an annual rate of 0.10% on the daily unused portion of the line
   of credit is allocated among the participating portfolios and funds at the
   end of each quarter.


6  Financial Instruments
   ----------------------------------------------------------------------------
   The Portfolio may trade in financial instruments with off-balance sheet risk
   in the normal course of its investing activities to assist in managing
   exposure to various market risks. These financial instruments include written
   options, forward foreign currency exchange contracts, and financial futures
   contracts and may involve, to a varying degree, elements of risk in excess of
   the amounts recognized for financial statement purposes. The notional or
   contractual amounts of these instruments represent the investment the
   Portfolio has in particular classes of financial instruments and does not
   necessarily represent the amounts potentially subject to risk. The
   measurement of the risks associated with these instruments is meaningful only
   when all related and offsetting transactions are considered. At December 31,
   1997 there were no outstanding obligations under these financial instruments.

                                       20
<PAGE>
 
Total Return Portfolio as of December 31, 1997

INDEPENDENT ACCOUNTANTS' REPORT


To the Trustees and Investors
of Total Return Portfolio
- -------------------------------------------------------------------------------
We have audited the accompanying statement of assets and liabilities of Total
Return Portfolio (the Portfolio), including the portfolio of investments, as of
December 31, 1997, and the related statement of operations for the year then
ended, the statements of changes in net assets for each of the two years then
ended and the supplementary data for each of the four years ended December 31,
1997 and for the period from October 23, 1993 (start of business) to December
31, 1993. These financial statements and supplementary data are the
responsibility of the Portfolio's management. Our responsibility is to express
an opinion on these financial statements and supplementary data based on our
audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements and supplementary
data are free of material misstatement. An audit includes examining, on a test
basis, evidence supporting the amounts and disclosures in the financial
statements. Our procedures included confirmation of securities held as of
December 31, 1997 by correspondence with the custodian and brokers. An audit
also includes assessing the accounting principles used and significant estimates
made by management, as well as evaluating the overall financial statement
presentation. We believe that our audits provide a reasonable basis for our
opinion. 

In our opinion, the financial statements and supplementary data referred to
above present fairly, in all material respects, the financial position of the
Portfolio as of December 31, 1997, and the results of its operations, the
changes in its net assets for each of the two years ended December 31, 1997 and
the supplementary data for each of the four years ended December 31, 1997 and
for the period from October 23, 1993 (start of business) to December 31, 1993,
in conformity with generally accepted accounting principles.

                                                COOPERS & LYBRAND L.L.P.
                                                Boston, Massachusetts
                                                February 6, 1998

                                      21




<PAGE>
 
EV Marathon Total Return Fund as of December 31, 1997

INVESTMENT MANAGEMENT


EV Marathon Total Return Fund

Officers

James B. Hawkes
President and Trustee

Edward E. Smiley, Jr.
Vice President

James L. O'Connor
Treasurer

Alan R. Dynner
Secretary


Trustees

M. Dozier Gardner
Vice Chairman, Eaton Vance Management

Donald R. Dwight
President, Dwight Partners, Inc.

Samuel L. Hayes, III
Jacob H. Schiff Professor of Investment Banking, 
Harvard University Graduate School of Business Administration

Norton H. Reamer
President and Director, United Asset Management Corporation

John L. Thorndike
Formerly Director, Fiduciary Company Incorporated

Jack L. Treynor
Investment Adviser and Consultant


Total Return Portfolio

Officers

M. Dozier Gardner
President, Trustee

James B. Hawkes
Vice President and Trustee

Timothy O'Brien
Vice President and Portfolio Manager

James L. O'Connor
Treasurer

Alan R. Dynner
Secretary


Independent Trustees

Donald R. Dwight
President, Dwight Partners, Inc.

Samuel L. Hayes, III
Jacob H. Schiff Professor of Investment Banking, 
Harvard University Graduate School of Business Administration

Norton H. Reamer
President and Director, United Asset Management Corporation

John L. Thorndike
Formerly Director, Fiduciary Company Incorporated

Jack L. Treynor
Investment Adviser and Consultant

                                      22
<PAGE>
 
                       This Page Intentionally Left Blank
<PAGE>
 
Investment Advisor of
Total Return Portfolio
Boston Management and Research
24 Federal Street
Boston, MA 02110


Administrator of
EV Marathon Total Return Fund
Eaton Vance Management
24 Federal Street
Boston, MA 02110


Principal Underwriter
Eaton Vance Distributors, Inc.
24 Federal Street
Boston, MA 02110
(617) 482-8260


Custodian
Investors Bank & Trust Company
200 Clarendon Street, 16th Floor
Boston, MA 02116


Transfer Agent
First Data Investor Services Group
Attention:  Eaton Vance Funds
P.O. Box 5123
Westborough, MA 01581-5123


Independent Accountants
Coopers & Lybrand L.L.P.
One Post Office Square
Boston, MA 02109



EV Marathon Total Return Fund
24 Federal Street
Boston, MA 02110



- --------------------------------------------------------------------------------
This report must be preceded or accompanied by a current prospectus which
contains more complete information on the Fund, including its sales charges and
expenses. Please read the prospectus carefully before you invest or send money.
- --------------------------------------------------------------------------------
                                                                    M-TMSRC-2/98




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