Exhibit 10.9(a)
June 1, 2010
Aspect Capital Ltd.
Nations House — 8th Floor
103 Wigmore Street
London W1U 1QS, U.K.
Attention: Mr. Anthony Todd
     Re: Management Agreement Renewals
Dear Mr. Todd:
We are writing with respect to your management agreements concerning the
commodity pools to which reference is made below (the “Management Agreements”).
We are extending the term of the Management Agreements through June 30, 2011 and
all other provisions of the Management Agreements will remain unchanged.

  •   Global Diversified Futures Fund L.P.     •   Diversified 2000 Futures Fund
L.P.     •   Tactical Diversified Futures Fund L.P.     •   CMF Aspect Master
Fund L.P.     •   Institutional Futures Portfolio L.P.     •   Global Futures
Fund Ltd.

Please acknowledge receipt of this modification by signing one copy of this
letter and returning it to the attention of Ms. Jennifer Magro at the address
above or fax to 212-793-1986. If you have any questions I can be reached at
212-559-5046.
Very truly yours,

          CERES MANAGED FUTURES LLC
      By:   /s/ Jennifer Magro         Jennifer Magro        Chief Financial
Officer & Director        ASPECT CAPITAL LTD.
      By:   /s/ Kenneth Hope         Print Name:   Kenneth Hope              

JM/sr