U.S. Open 2011 (153 images)

Serena Williams, USA, returns the ball to Anastasia Pavlyuchenkova of Russia during their quarter-finals match at the U.S. Open held at the National Tennis Center on September 8, 2011 in New York. UPI/Monika Graff

Roger Federer of Switzerland hits a forehand to Jo-Wilfried Tsonga of France in their quarterfinal match in Arthur Ashe Stadium at the U.S. Open Tennis Championships at the Billie Jean King National Tennis Center in New York City on September 8, 2011. Federer defeated Tsonga 6-4, 6-3, 6-3. UPI/John Angelillo

Jo-Wilfried Tsonga of France and Roger Federer of Switzerland sit while Tournament Director Jim Curley decides if play is to be suspended due to rain in their quarterfinal match in Arthur Ashe Stadium at the U.S. Open Tennis Championships at the Billie Jean King National Tennis Center in New York City on September 7, 2011. UPI/John Angelillo

Gilles Simon of France returns the ball to John Isner, USA, during fourth-round action at the U.S. Open held at the National Tennis Center on September 8, 2011 in New York. UPI/Monika Graff