Defending champion Novak Djokovic, soon-to-be retiring Andy Roddick and women's No. 3 seed Maria Sharapova are among the notables in action Sunday during the 2012 U.S. Open.

Djokovic, the No. 2 seed in this year's tournament, faces Julien Benneteau at 11 a.m. at Arthur Ashe Stadium. Their match will be followed at approximately 1:30 p.m. by Andy Roddick, who announced that he'd retire at the end of the 2012 U.S. Open, against Fabio Fognini. Those are both third round matchups. Sharapova faces Nadia Petrova at 7 p.m. in a fourth round matchup.

Both the men's and women's top seeds advanced yesterday. Roger Federer beat Fernando Verdasco, setting up a fourth round matchup between Federer and Mardy Fish. Serena Williams beat Ekaterina Makarova to advance.

TV coverage of today's matches is from 11 a.m. to 6 p.m. on CBS and from 7 p.m. to 11 p.m. on The Tennis Channel.

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