Thomaz Koch is a former tennis player from Brazil, who was a quarterfinalist 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. 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.