2016 U.S. Open - Day 7 Caroline Wozniacki of Denmark celebrates her win against Madison Keys of the United States in the Women's Singles round four match on Arthur Ashe Stadium on day six of the 2016 US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on September 4, 2016 in Flushing, Queens, New York City. (Photo by Tim Clayton/Corbis via Getty Images)
