U.S. Open tennis 2012 (103 images)

Caroline Wozniacki of Denmark sits on the court and receives treatment during an injury time out in the second set of her first round match against Irina-Camelia Begu of Romania at the 2012 U.S. Open Tennis Championships in Arthur Ashe Stadium at the Billie Jean King National Tennis Center in New York City on August 28, 2012. Camelia Begu defeated Wozniacki 6-3, 6-2. UPI/John Angelillo

Irina-Camelia Begu of Romania hits a backhand in the first set of her first round match against Caroline Wozniacki of Denmark at the 2012 U.S. Open Tennis Championships in Arthur Ashe Stadium at the Billie Jean King National Tennis Center in New York City on August 28, 2012. Camelia Begu defeated Wozniacki 6-3, 6-2. UPI/John Angelillo

Novak Djokovic of Serbia serves to Paolo Lorenzi of Italy in the first set of their first round match at the 2012 U.S. Open Tennis Championships in Arthur Ashe Stadium at the Billie Jean King National Tennis Center in New York City on August 28, 2012. UPI/John Angelillo

Yen-Hsun Luin of Taiwan takes on Sam Querrey, USA, in the second set during first-round action at the U.S. Open held at the National Tennis Center on August 28, 2012 in New York. UPI Photo/Monika Graff