Serena Williams of the U.S. reacts during her quarterfinal match against Petra Kvitova of Czech Republic during the WTA Qatar Ladies Open tennis tournament in Doha, Qatar, Friday, Feb. 15, 2013. (AP Photo/Osama Faisal)

Associated Press
Serena Williams of the U.S. reacts during her quarterfinal match against Petra Kvitova of Czech Republic during the WTA Qatar Ladies Open tennis tournament in Doha, Qatar, Friday, Feb. 15, 2013. (AP Photo/Osama Faisal)
Serena Williams of the U.S. reacts during her quarterfinal match against Petra Kvitova of Czech Republic during the WTA Qatar Ladies Open tennis tournament in Doha, Qatar, Friday, Feb. 15, 2013. (AP Photo/Osama Faisal)
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