Petra Kvitova of Czech Republic returns the ball to Serena Williams of the U.S. during their quarterfinal of the WTA Qatar Ladies Open tennis tournament in Doha, Qatar, Friday, Feb. 15,

 

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