Caroline Wozniacki of Denmark hits a return to Serena Williams of the U.S. during their WTA Finals singles semi-finals tennis match at the Singapore Indoor Stadium October 25, 2014. REUTERS/Edgar Su ... more 
Caroline Wozniacki of Denmark hits a return to Serena Williams of the U.S. during their WTA Finals singles semi-finals tennis match at the Singapore Indoor Stadium October 25, 2014. REUTERS/Edgar Su (SINGAPORE - Tags: SPORT TENNIS) less 
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Reuters | Photo By EDGAR SU / REUTERS
Sat, Oct 25, 2014 3:54 AM EDT