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PRAGUE, CZECH REPUBLIC - NOVEMBER 09: Petra Kvitova of the Czech Republic celebrates after winning a point during the third rubber of the Fed Cup Final between Petra Kvitova of the Czech Republic and Angelique Kerber of Germany at the O2 arena on November 9, 2014 in Prague, Czech Republic. (Photo by Adam Pretty/Bongarts/Getty Images)

PRAGUE, CZECH REPUBLIC - NOVEMBER 09:  Petra Kvitova of the Czech Republic celebrates after winning a point during the third rubber of the Fed Cup Final between Petra Kvitova of the Czech Republic and Angelique Kerber of Germany at the O2 arena on November 9, 2014 in Prague, Czech Republic.  (Photo by Adam Pretty/Bongarts/Getty Images)