Which of the Grand Slam tournaments is played on a clay surface?

Clay courts slow down the ball and produce a high bounce when compared to grass courts or hard courts. For this reason, clay courts take away some of the advantages of big servers and serve-and-volleyers, which makes it hard for these types of players to dominate on the surface. For example, Pete Sampras and who won 14 Grand Slam titles, never won the French Open Other notable players who have won multiple Grand Slam events have never won the French Open, including John McEnroe, Venus Williams, Jimmy Connors