Kei Nishikori of Japan serves to Stan Wawrinka of Switzerland during their quarterfinal match at the 2014 US Open tennis tournament in New York, Sept 3, 2014. [Photo/Agencies]
Perfect returns help Wozniacki return to Slam semi
Peng advances to US Open semifinals
Hernandez joins Madrid, Valencia gets Negredo
Azarenka tops qualifier Krunic to reach US Open quarters
US Open
Nanjing Youth Olympics
China Open
Chinese leaders' passion for sports