US Open 2012, Day 1

Roger Federer of Switzerland returns a shot to Donald Young during a match at the US Open in New York. Federer won 6-3, 6-2, 6-4. (AP Photo)

Maria Sharapova of Russia returns a shot to Melinda Czink of Hungary during the first round of play at the 2012 US Open Tennis tournament in New York. (AP Photo)

Britain's Andy Murray returns a shot to Alex Bogomolov Jr. of Russia, at the 2012 US Open in New York. (AP Photo)

Kim Clijsters thanks the crowd after defeating Victoria Duval 6-3, 6-1 in the first round of play at the US Open in New York. (AP Photo)

Victoria Azarenka reacts after returning a shot to Alexandra Panova in a match at the US Open in New York. (AP Photo)

Daniela Hantuchova reacts during a match against Anastasia Pavlyuchenkova at the US Open in New York. (AP Photo)

Croatia's Marin Cilic returns a shot during his men's singles first round match against Marinko Matosevic of Australia at the US Open in New York. (AFP Photo)

Donald Young argues a call during a match against Roger Federer in the first round of play at the US Open in New York. (AP Photo)

Li Na of China serves during her women's singles first round match against Heather Watson of Great Britain at the US Open in New York. (AFP Photo)

Melanie Oudin of the United States returns a shot during her women's singles first round match against Lucie Safarova of Czech Republic at the US Open in New York. (AFP Photo)