Once, in 1990. He defeated Andre Agassi for the title 6-3, 2-6, 6-4, 6-4.
Andres Gomez
Andres Gimeno
Andres Gomez defeated Andre Agassi 6-3, 2-6, 6-4, 6-4 to win the 1990 French Open Men's Singles championship.
8 times
6 times
Chris Evert
Chris Evert. The American who has won the french open 7 times. (1974,1975,1979,1980,1983,1985 and then her last in 1986).
Rafeal Nadal
Chris Evert
Throughout his professional career (1977-1992), McEnroe played in the French open 10 times but never actually one the title itself.
Rafael Nadal has won the French Open 5 times(2005, 2006, 2007, 2008, 2010)
Bjorn Borg has won the French Open 6 times (1974-75, 1978-81). This does not include the time period before 1968, when the tournament was referred to as the French Championships. The French Championships were not "Open" to players that were not members of french tennis clubs or french nationals.