Images from Thursday's action at the U.S. Open
Kurumi Nara of Japan hits a return to Sorana Cirstea of Romania at the U.S. Open tennis championships in New York August 29, 2013.MIKE SEGAR/Reuters
Kurumi Nara of Japan hits a return to Sorana Cirstea of Romania at the U.S. Open tennis championships in New York August 29, 2013. Nara won 7-5, 6-1.MIKE SEGAR/Reuters
Sara Errani of Italy hits a return to compatriot Flavia Pennetta at the U.S. Open tennis championships in New York August 29, 2013. Errani lost 3-6, 1-6.MIKE SEGAR/Reuters
Eugenie Bouchard of Canada hits a return to Angelique Kerber of Germany at the U.S. Open tennis championships in New York August 29, 2013.ADAM HUNGER/Reuters
Angelique Kerber of Germany hits a return against Eugenie Bouchard of Canada at the U.S. Open tennis championships in New York August 29, 2013.ADAM HUNGER/Reuters
Angelique Kerber of Germany chases down a return against Eugenie Bouchard of Canada at the U.S. Open tennis championships in New York August 29, 2013. Kerber advanced with a 6-4, 2-6, 6-3 victory.ADAM HUNGER/Reuters
Roberta Vinci of Italy hits a return to Lucie Safarova of the Czech Republic at the U.S. Open tennis championships in New York August 29, 2013.EDUARDO MUNOZ/Reuters
Lucie Safarova of the Czech Republic hits a return to Roberta Vinci of Italy at the U.S. Open tennis championships in New York August 29, 2013. Vinci won 4-6, 6-1, 6-2.EDUARDO MUNOZ/Reuters
Sorana Cirstea, of Romania, returns a shot against Japan's Krumi Nara during the second round of the 2013 U.S. Open tennis tournament, Thursday, Aug. 29, 2013, in New York.Mike Groll/The Associated Press
Flavia Pennetta of Italy serves to compatriot Sara Errani at the U.S. Open tennis championships in New York August 29, 2013.MIKE SEGAR/Reuters
Svetlana Kuznetsova of Russia serves to Peng Shuai of China at the U.S. Open tennis championships in New York August 29, 2013. Kuznetsova advanced with a 6-1 4-6 6-4 victory.EDUARDO MUNOZ/Reuters
Jelena Jankovic of Serbia returns to Alisa Kleybanova of Russia at the U.S. Open tennis championships in New York August 29, 2013. Jankovic won 6-3 6-2.RAY STUBBLEBINE/Reuters
Serena Williams of the U.S. returns to Galina Voskoboeva of Kazakhstan at the U.S. Open tennis championships in New York August 29, 2013.MIKE SEGAR/Reuters
Serena Williams of the U.S. falls while playing Galina Voskoboeva of Kazakhstan at the U.S. Open tennis championships in New York August 29, 2013. Williams advanced with a 6-3 6-0 victory.Reuters
Roberto Bautista Agut of Spain serves to compatriot David Ferrer at the U.S. Open tennis championships in New York August 29, 2013. Ferrer won ) 6-3 6-7(5) 6-1 6-2.Reuters
Roger Federer of Switzerland returns to Carlos Berlocq of Argentina at the U.S. Open tennis championships in New York August 29, 2013. Federer advanced with a 6-3 6-2 6-1 victory.Reuters
Tommy Robredo of Spain returns a backhand to Frank Dancevic of Canada at the U.S. Open tennis championships in New York, August 29, 2013.Reuters
Victoria Azarenka of Belarus serves to Aleksandra Wozniak of Canada at the U.S. Open tennis championships in New York August 29, 2013.Reuters
Aleksandra Wozniak of Canada serves to Victoria Azarenka of Belarus at the U.S. Open tennis championships in New York August 29, 2013. Azarenka advanced with a 6-3 6-1 win.Reuters
Sam Querrey of the U.S. serves to Adrian Mannarino of France at the U.S. Open tennis championships in New York August 29, 2013. Mannarino won 7-6(4) 7-6(5) 6-7(5) 6-4.Reuters
Frank Dancevic of Canada chases down a backhand to Tommy Robredo of Spain at the U.S. Open tennis championships in New York, August 29, 2013. Robredo advanced with a 6-4 6-4 6-1 victory.Reuters
Milos Raonic of Canada serves to Pablo Andujar of Spain at the U.S. Open tennis championships in New York, August 29, 2013. Raonic won 6-1, 6-2, 6-4.Reuters
Rafael Nadal, of Spain, returns against Rogerio Dutra Silva, of Brazil, during the second round of the 2013 U.S. Open tennis tournament, Thursday, Aug. 29, 2013, in New York. Nadal advanced with a 6-2 6-1 6-0 victory.Charles Krupa