which grand slam tennis tournament is played on red clay courts?

The French Open is played on red clay courts.

The red clay found in France gives this tournament its namesake while other types of surface are used for the events that precede it, to order and condition the courts. As the surface does not usually affect a player’s stamina or resistance, it can be disturbed by wind and adversely affects play for both ball winners and server. Imagine if you never had to get up from your computer desk to stretch! But all jokes aside World No 1 Rafael Nadal has won 10 French Opens in an row; only two Spaniards have done better (Manolo Santana with 14 Grand Slams victories between 1951-65, and Manuel Alonso who contested 13 between 1968-74).