Thomaz Koch (born 11 May 1945) is a former tennis player from Brazil. He won one Grand Slam title in mixed doubles at the 1975 French Open. In singles he was a quarterfinalist in singles at the French Open, Wimbledon and the U.S. National Championships. Koch was active from 1961 to 1985 and played close to 900 singles matches, and won 36 career singles titles. He was ranked World No 12 player for 1967. His highest computer ranking which was past his peak period in the ATP singles ranking was No. 24 (achieved on December 20, 1974). In addition he also won 5 challenger satellite tour tiles towards the end of his career. He won also two gold medals in the men's tennis competition at the 1967 Pan American Games.
He played his first tournament in 1961 at the Santos Open where he reached the final. He won his first senior title in 1964 at the Swiss International Championships against compatriot Ronald Barnes. He won his final main tour title in 1976 at the Malta International against Britain's Roger Taylor. He played his final singles tournament in 1984 at the Guarujá Open in 1984. He also won the Wimbledon Plate twice, in 1969 and 1975.
Career finals Singles (3–2) (incomplete list) ResultW–LDateTournamentSurfaceOpponentScoreWin 1–0 1969 Caracas, Venezuela Hard Mark Cox 8–6, 6–3, 2–6, 6–4Win 2–0 1969 Washington, U.S. Clay Arthur Ashe 7–5, 9–7, 4–6, 2–6, 6–4Win 3–0 1971 Caracas, Venezuela Hard Manuel Orantes 7–6, 6–1, 6–3Loss 3–1 1976 Khartoum, Sudan Hard Mike Estep 4–6, 7–6, 4–6, 3–6Loss 3–2 1976 Nuremberg, Germany Carpet (i) Frew McMillan 6–2, 3–6, 4–6
Doubles (3–8) ResultW–LDateTournamentSurfacePartnerOpponentsScoreLoss 0–1 1968 Barcelona, Spain Clay José Mandarino Carlos Fernandes Patricio Rodríguez 2–6, 6–3, 6–3, 1–6, 4–6Loss 0–2 1969 London/Queen's, U.K. Grass Ove Nils Bengtson Owen Davidson Dennis Ralston 6–8, 3–6Loss 0–3 1971 Salisbury, U.S. Hard (i) Clark Graebner Juan Gisbert, Sr. Manuel Orantes 3–6, 6–4, 6–7Win 1–3 1971 Macon, U.S. Hard Clark Graebner Željko Franulović Jan Kodeš 6–3, 7–6Loss 1–4 1971 Hampton, U.S. Hard (i) Clark Graebner Ilie Năstase Ion Țiriac 4–6, 6–4, 5–7Win 2–4 1971 Caracas, Venezuela Clay José Edison Mandarino Gerald Battrick Peter Curtis 6–4, 3–6, 6–7, 6–4, 7–6Loss 2–5 1972 Washington D.C., U.S. Carpet (i) Clark Graebner Tom Edlefsen Cliff Richey 4–6, 3–6Loss 2–6 Jul 1974 Gstaad, Switzerland Clay Roy Emerson José Higueras Manuel Orantes 5–7, 6–0, 1–6, 8–9Win 3–6 1975 Istanbul, Turkey Clay Colin Dibley Colin Dowdeswell John Feaver 6–2, 6–2, 6–2Loss 3–7 1982 Itaparica, Brazil Carpet José Schmidt Givaldo Barbosa João Soares 6–7, 1–2 ret.Loss 3–8 1983 Bahia, Brazil Hard Ricardo Cano Givaldo Barbosa João Soares
Mixed doubles (1–0) ResultYearChampionshipSurfacePartnerOpponentsScoreWin 1975 French Open Clay Fiorella Bonicelli Jaime Fillol Pam Teeguarden 6–4, 7–6
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