Angelique Kerber of Germany reacts after defeating Venus Williams. -Photo by Reuters

Serena Williams of the United States reacts against Maria Jose Martinez Sanchez. -Photo by AFP

A tennis fan sits in front of a fountain at the National Tennis Centre at the U.S. Open tennis tournament in New York. -Photo by Reuters

Roger Federer of Switzerland looks up at the crowd following his evening win over Bjorn Phau of Germany. -Photo by Reuters

Venus Williams of the U.S. reacts in the third set of her loss to Angelique Kerber of Germany. -Photo by Reuters

Andy Roddick speaks during a news conference announcing his retirement. -Photo by Reuters

Sara Errani, of Italy, sets to return to Vera Dushevina. -Photo by Reuters