Juan Martín Del Potro demolished Spanish Tomy Robredo (6-3, 6-4, 6-2) and got his ticket to Rolland Garros semi-finals. Federer defeated Frenchman Monfils (7-6, 6-2, 6-4) and is already among the best four.  On the women's board, Cirstea lost to Stosur and Kuznetsova defeated S. Williams.

Today's matches:

MEN
Roger Federer (SWI) def. Gael Monfils (FRE)
7-6, 6-2, 6-4

Juan Martín del Potro (ARG) def. Tommy Robredo (ESP)
6-3, 6-4, 6-2

WOMEN
Samantha Stosur (AUS) (30) def. Sorana Cirstea (ROU)
6-1, 6-3

Svetlana Kuznetsova (RUS) (7) def. Serena Williams (USA) (2)
7-6(3), 5-7, 7-5