Angelique Kerber of Germany clenches her fist after winning a point during her match against Petra Cetkovska of the Czech Republic during the quarterfinals of the WTA Qatar Ladies Open in Doha, Qatar, Friday, Feb. 14, 2014. (AP Photo/Osama Faisal)

Mideast Qatar Ladies Open Tennis

Angelique Kerber of Germany clenches her fist after winning a point during her match against Petra Cetkovska of the Czech Republic during the quarterfinals of the WTA Qatar Ladies Open in Doha, Qatar, Friday, Feb. 14, 2014. (AP Photo/Osama Faisal)

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