Tim Chisholm (born October 31, 1969) is a semi-retired American real tennis player.

[citation needed] Although technically not a Grand Slam, at one point in 2003 Chisholm held all four major open titles at the same time.

[citation needed] Chisholm challenged former World Champion Robert Fahey three times for the singles title.

[citation needed] He then retired as head professional at the Racquet Club and took an office job in Boston, Massachusetts, only playing in American tournaments.

[citation needed] In January 2006, he decided to attempt the World Challenge again, and although he won his preliminary matches handily, he fell to Fahey 7–0 in the championship.