Serena Williams changes sides after the first game in her 3rd round match against Bethanie Mattek-Sands in Arthur Ashe Stadium on day five at the US Open Tennis Championships at the USTA Billie Jean King National Tennis Center in New York City on September 4, 2015. Serena Williams is trying to become the first woman to win the Tennis Grand Slam since Steffi Graf in 1988. Photo by John Angelillo/UPI
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