Roger Federer defeated Robin Söderling in the final, 6–1, 7–6(7–1), 6–4 to win the men's singles tennis title at the 2009 French Open.

It was Federer's fourth consecutive French Open final, having lost the previous three to Rafael Nadal.

Söderling was the first Swedish major finalist since Thomas Johansson at the 2002 Australian Open.

[1] Nadal was the four-time defending champion, but was defeated in the fourth round by Söderling.

It was Nadal's first defeat at the French Open, having won the title in all four of his previous appearances since debuting in 2005 and winning his first 31 matches.