Doug Flach (born August 10, 1970) is a former tennis player from the United States.

He also defeated Agassi in 1997 at Washington, D.C. Additionally, Flach had career wins over Ivan Lendl, Pat Rafter, Gustavo Kuerten, and Thomas Johansson.

Flach won two doubles titles: one with Paul Annacone and the other with Sandon Stolle.

His older brother Ken was a prominent tour doubles player in the late 1980s and early 1990s.

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