Aaron Krickstein (born August 2, 1967),[1] nicknamed "Marathon Man",[2] is an American former professional tennis player who competed on the ATP Tour from 1983 to 1996.

[3] He achieved this ranking on the back of wins in Sydney and Los Angeles, as well as his best ever results at Wimbledon and the US Open.

He is perhaps best known for his five-set, marathon loss to Jimmy Connors at the 1991 US Open, which ESPN called "an instant classic".

[6] Krickstein is Jewish and in the early 1990s was one of three highly ranked Jewish-American tennis players, along with Jay Berger and Brad Gilbert.

[15] He became an active competitor on the high school tennis scene during his teens, and still holds the Michigan record for most consecutive match wins at this level (56).

[8] Krickstein had an injury-plagued career, which included stress fractures in his feet, problems with his knees and wrists in 1985 and 1986, and injuries suffered when he was hurt in a car accident in 1987.

Krickstein is perhaps best remembered for his famous five-set match against Jimmy Connors on Labor Day at the 1991 US Open.

[25] The highlight of Krickstein's Davis Cup career came in 1990 when he scored two, hard-fought victories in a World Group Quarterfinal tie against Czechoslovakia, leading his team to a 4–1 win.