CINCINNATI, OH - Nick Kyrgios (AUS) during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 16, 2017, (Photo by George Walker/DFWsportsonline
CINCINNATI, OH - Caroline Wozniacki (DEN) during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 16, 2017, (Photo by George Walker/DFWsportsonline
CINCINNATI, OH - Caroline Wozniacki (DEN) during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 16, 2017, (Photo by George Walker/DFWsportsonline
CINCINNATI, OH - Caroline Wozniacki (DEN) during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 16, 2017, (Photo by George Walker/DFWsportsonline
CINCINNATI, OH - Caroline Wozniacki (DEN) during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 16, 2017, (Photo by George Walker/DFWsportsonline
CINCINNATI, OH - Frances Tiafoe (USA) during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 16, 2017, (Photo by George Walker/DFWsportsonline
CINCINNATI, OH - Frances Tiafoe (USA) during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 16, 2017, (Photo by George Walker/DFWsportsonline
CINCINNATI, OH - Angelique Kerber (GER) during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 16, 2017, (Photo by George Walker/DFWsportsonline
CINCINNATI, OH - Angelique Kerber (GER) during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 16, 2017, (Photo by George Walker/DFWsportsonline
CINCINNATI, OH - View of Center Court during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 16, 2017, (Photo by George Walker/DFWsportsonline
CINCINNATI, OH - John Isner (USA) receives serve during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 13, 2017, (Photo by George Walker/DFWsportsonline
CINCINNATI, OH - Viktor Troicki (SRB) stretches for a backhand during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 13, 2017, (Photo by George Walker/DFWsportsonline
CINCINNATI, OH - John Isner (USA) hits a backhand during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 13, 2017, (Photo by George Walker/DFWsportsonline
CINCINNATI, OH - John Isner (USA) stretches for a backhand during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 13, 2017, (Photo by George Walker/DFWsportsonline
CINCINNATI, OH - John Isner (USA) hits a forehand during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 13, 2017, (Photo by George Walker/DFWsportsonline
CINCINNATI, OH - Viktor Troicki (SRB) hits a backhand during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 13, 2017, (Photo by George Walker/DFWsportsonline
CINCINNATI, OH - John Isner (USA) hits a forehand volley during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 13, 2017, (Photo by George Walker/DFWsportsonline
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CINCINNATI, OH - John Isner (USA) stretches for a forehand during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 13, 2017, (Photo by George Walker/DFWsportsonline
CINCINNATI, OH - AUGUST 14: CoCo Vandeweghe hits a forehand during the Western & Southern Open at the Lindner Family Tennis Center in Mason, Ohio on August 14, 2017. (Photo by George Walker/Icon Sportswire)

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