See main article: 1991 French Open.
Jim Courier defeated Andre Agassi in the final, 3–6, 6–4, 2–6, 6–1, 6–4 to win the men's singles tennis title at the 1991 French Open. It was his first major singles title.
Andrés Gómez was the reigning champion, but did not compete this year.
Boris Becker was attempting to complete the career Grand Slam, but lost to Agassi in the semifinals.
The seeded players are listed below. Jim Courier is the champion; others show the round in which they were eliminated.
Stefan Edberg (quarterfinals)
Boris Becker (semifinals)
Andre Agassi (finals)
Sergi Bruguera (second round) Pete Sampras (second round)
Guy Forget (fourth round) Jim Courier (champion) Michael Chang (quarterfinals) Emilio Sánchez (second round) Michael Stich (semifinals) John McEnroe (first round) Brad Gilbert (first round)