Both of the top seeds in the 2011 U.S. Open are in action on Tuesday, with Caroline Wozniacki and Novak Djokovic both scheduled to start their tournaments at Arthur Ashe Stadium. Rafael Nadal and Serena Williams are also in action at Ashe in an absolutely loaded day of tennis. Other big matches include Fernando Verdasco, Jo-Wilfried Tsonga and Li Na. Here's a schedule of some of the biggest matches of the day.
No. 1 Novak Djokovic vs. Conor Niland - Early session, Arthur Ashe Stadium
Andrey Golubev vs. No. 2 Rafael Nadal - 7:00 P.M. ET, Arthur Ashe Stadium
No. 6 David Ferrer vs. Igor Andreev - 11:00 A.M. ET, Louis Armstrong Stadium
No. 11 Jo-Wilfried Tsonga vs. Yen-Hsun Lu - 11:00 A.M. ET, Grandstand
No. 4 Victoria Azarenka vs. Johanna Larsson - 11:00 A.M. ET, Arthur Ashe Stadium
No. 1 Caroline Wozniacki vs. Nuria Llagostera Vives - 1:00 P.M. ET or later, Arthur Ashe Stadium
Bojana Jovanovski vs. No. 28 Serena Williams - Night session, Arthur Ashe Stadium
Galina Voskoboeva vs. No. 7 Francesca Schiavone - Early session, Louis Armstrong Stadium
A complete schedule of play can be found on the official website of the U.S. Open.