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PRAGUE, CZECH REPUBLIC - NOVEMBER 11: Sofia Kenin of USA returns a ball to Katerina Siniakova of Czech Republic during the Fed Cup Final between Czech Republic and USA, at O2 Arena on November 11, 2018 in Prague, Czech Republic. (Photo by Srdjan Stevanovic/Getty Images)

PRAGUE, CZECH REPUBLIC - NOVEMBER 11: Sofia Kenin of USA  returns a ball to Katerina Siniakova of Czech Republic during the Fed Cup Final between Czech Republic and USA, at O2 Arena on November 11, 2018 in Prague, Czech Republic. (Photo by Srdjan Stevanovic/Getty Images)