2012 US Open: Day 4

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Ayumi%20Morita%20of%20Japan%20returns%20a%20shot%20during%20her%20women%26%238217%3Bs%20singles%20second-round%20match%20against%20Tsvetana%20Pironkova%20of%20Bulgaria%20on%20Day%20Four%20of%20the%202012%20US%20Open.%20%28Photo%20by%20Elsa%2FGetty%20Images%29%20

Philipp%20Petzschner%20of%20Germany%20returns%20a%20shot%20during%20his%20men%26%238217%3Bs%20singles%20second-round%20match%20against%20Nicolas%20Almagro%20of%20Spain%20during%20Day%20Four%20of%20the%202012%20US%20Open.%20%28Photo%20by%20Matthew%20Stockman%2FGetty%20Images%29%20

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Stefan%20Kendal%20Gordy%2C%20better%20known%20by%20his%20stage%20name%20Redfoo%20from%20the%20band%20LMFAO%2C%20and%20tennis%20player%20Ayaka%20Okuno%20from%20Japan%20watch%20the%20match%20of%20Nikolay%20Davydenko%20of%20Russia%20against%20Mardy%20Fish%20of%20the%20U.S.%20during%20their%202012%20US%20Open%20match.%20%28Photo%20credit%20should%20read%20TIMOTHY%20A.%20CLARY%2FAFP%2FGettyImages%29%20

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Kei%20Nishikori%20of%20Japan%20reacts%20after%20defeating%20Tim%20Smyczek%20of%20the%20United%20States%20during%20their%20men%26%238217%3Bs%20singles%20second-round%20match%20on%20Day%20Four%20of%20the%202012%20US%20Open.%20%28Photo%20by%20Dan%20Istitene%2FGetty%20Images%29%20

Jelena%20Jankovic%20of%20Serbia%20returns%20a%20shot%20against%20Lara%20Arruabarrena-Vecino%20of%20Spain%20during%20their%20women%26%238217%3Bs%20singles%20second-round%20match%20on%20Day%20Four%20of%20the%202012%20US%20Open.%20%28Photo%20by%20Elsa%2FGetty%20Images%29%20

Ana%20Ivanovic%20of%20Serbia%20celebrates%20after%20winning%20her%20match%20against%20Sofia%20Arvidsson%20of%20Sweden%20during%20their%202012%20US%20Open%20match.%20%28Photo%20credit%20should%20read%20TIMOTHY%20A.%20CLARY%2FAFP%2FGettyImages%29

Maria%20Kirilenko%20of%20Russia%20returns%20a%20shot%20against%20Greta%20Arn%20of%20Hungary%20during%20Day%20Four%20of%20the%202012%20US%20Open.%20%20%28Photo%20by%20Cameron%20Spencer%2FGetty%20Images%29%20