Roland Garros is where the French Open tennis tournament is held. It is in Paris, the capital city of France. Along with Wimbledon and the US and Australian Open tournaments, the French Open is one of the four major tournaments in the tennis calendar. It is the only one of the four to be contested on clay, which slows down the ball; this favors players suited to long, attritional rallies and disfavors those with strong serves or good volleying ability. Speed around the court is also most important on clay.
Some notable tennis players who have been dominant on other surfaces have found it more difficult to win at Roland Garros. Roger Federer has only won the tournament once, usually losing to Rafael Nadal in other years, and the great Pete Sampras never won, much as the clay- and hard-court great Ivan Lendl could never win on the fast, lush grass of Wimbledon.
The current (2012) French Open champion is Rafael Nadal, who has won the tournament a record seven times and has rarely lost a match at Roland Garros.