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2017 U.S. Open Tennis Tournament - DAY TWELVE. CoCo Vandeweghe of the United States (pictured) and Horia Tecau of Romania in action against Martina Hingis of Switzerland and Jamie Murray of Great Britain in the Mixed Doubles Semifinal at the US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on September 08, 2017 in Flushing, Queens, New York City. (Photo by Tim Clayton/Corbis via Getty Images)

2017 U.S. Open Tennis Tournament - DAY TWELVE.  CoCo Vandeweghe of the United States (pictured) and Horia Tecau of Romania in action against Martina Hingis of Switzerland and Jamie Murray of Great Britain in the Mixed Doubles Semifinal at the US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on September 08, 2017 in Flushing, Queens, New York City. (Photo by Tim Clayton/Corbis via Getty Images)