ADJECTIVE (2)

1. provided with a worthy adversary or competitor;
- Example: "matched teams"

2. going well together; possessing harmonizing qualities;

The Collaborative International Dictionary of English v.0.48:

Match \Match\, v. t. [imp. & p. p. Matched; p. pr. & vb. n.
   Matching.]
   1. To be a mate or match for; to be able to complete with; to
      rival successfully; to equal.
      [1913 Webster]

            No settled senses of the world can match
            The pleasure of that madness.         --Shak.
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   2. To furnish with its match; to bring a match, or equal,
      against; to show an equal competitor to; to set something
      in competition with, or in opposition to, as equal.
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            No history or antiquity can matchis policies and his
            conduct.                              --South.
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   3. To oppose as equal; to contend successfully against.
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            Eternal might
            To match with their inventions they presumed
            So easy, and of his thunder made a scorn. --Milton.
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   4. To make or procure the equal of, or that which is exactly
      similar to, or corresponds with; as, to match a vase or a
      horse; to match cloth. "Matching of patterns and colors."
      --Swift.
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   5. To make equal, proportionate, or suitable; to adapt, fit,
      or suit (one thing to another).
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            Let poets match their subject to their strength.
                                                  --Roscommon.
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   6. To marry; to give in marriage.
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            A senator of Rome survived,
            Would not have matched his daughter with a king.
                                                  --Addison.
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   7. To fit together, or make suitable for fitting together;
      specifically, to furnish with a tongue and a groove, at
      the edges; as, to match boards.
      [1913 Webster]

   Matching machine, a planing machine for forming a tongue or
      a groove on the edge of a board.
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WordNet (r) 3.0 (2006):

matched
    adj 1: provided with a worthy adversary or competitor; "matched
           teams"
    2: going well together; possessing harmonizing qualities [ant:
       mismatched]

Moby Thesaurus II by Grady Ward, 1.0:

66 Moby Thesaurus words for "matched":
   adapted, allied, assembled, associated, balanced, banded together,
   biconjugate, biform, bifurcated, bigeminate, bijugate, bilateral,
   bipartisan, bipartite, bound, bracketed, collected, conformable,
   conjoined, conjugate, conjugated, connected, coordinated, copulate,
   coupled, dichotomous, double, duadic, dual, dualistic, duplex,
   duplicated, dyadic, fitted, gathered, hand-in-glove, hand-in-hand,
   harmonized, identical, incorporated, integrated, intimate, joined,
   knotted, leagued, linked, married, mated, merged, one, paired,
   partnered, similar, spliced, suited, tied, twain, twin, twinned,
   two, two-sided, undivided, united, unseparated, wedded, yoked