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2017 U.S. Open Tennis Tournament - DAY THREE. Alexander Zverev of Germany in action against Borna Coric of Croatia during the Men'u2019s Singles round two match at the US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on August 30, 2017 in Flushing, Queens, New York City. (Photo by Tim Clayton/Corbis via Getty Images)'n

2017 U.S. Open Tennis Tournament - DAY THREE.  Alexander Zverev of Germany in action against Borna Coric of Croatia during the Men'u2019s Singles round two match at the US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on August 30, 2017 in Flushing, Queens, New York City.  (Photo by Tim Clayton/Corbis via Getty Images)'n