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Martin Wostenholme (born October 11, 1962) is a Canadian former touring professional tennis and Davis Cup player. A right-handed predominantly base-line player, Wostenholme was from 1981 to 1984 a four-time All-Ivy Leaguer in singles at Yale University. He had a career ATP singles high ranking of world No. 84, which he attained in November 1985. His career ATP tour win-lost record stands at 49 and 84.
Wostenholme had his best results on clay; a semi-finals appearance at the Guaruja, Brazil Grand Prix event in 1988 and 1991; a quarter-finals showing in the Stuttgart Outdoor Grand Prix event in 1989; and a semi-finalist in the Rio de Janeiro Grand Prix event in 1990. Wostenholme was the first Canadian to win a match at each of the four Grand Slam events, reaching the second rounds of the 1985 U.S. Open, the 1986 French Open and Wimbledon Championships, and the 1990 Australian Open.
In Davis Cup, Wostenholme had a career singles win-lose record of 12 and 8. He was a member of Canada's first ever squad to play the World Group, in 1991/92.
- "Canadian Tennis Hall of Fame". Tennis Canada.