Petra Kvitova of Czech Republic reacts after a shot to Agnieszka Radwanska of Poland during their tennis match at the WTA championship in Istanbul, Turkey, Tuesday, Oct. 23, 2012. (AP P

 

              Petra Kvitova of Czech Republic reacts after a shot to Agnieszka Radwanska of Poland during their tennis match at the WTA championship in Istanbul, Turkey, Tuesday, Oct. 23, 2012. (AP P
Petra Kvitova of Czech Republic reacts after a shot to Agnieszka Radwanska of Poland during their tennis match at the WTA championship in Istanbul, Turkey, Tuesday, Oct. 23, 2012. (AP Photo)