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JOHN ANGELILLO/UPI/MAXPPP - A ball girl waits in position to retrieve a ball as Serena Williams changes sides with her opponent in her straight sets semifinal victory over Anastasija Sevastova of Latvia in Arthur Ashe Stadium at the 2018 US Open Tennis Championships at the USTA Billie Jean King National Tennis Center in New York City on September 6, 2018. Photo by John Angelillo/UPI