Sports Who is the 15-year-old who beat 39-year-old Venus Williams at Wimbledon? July 1, 2019 Scott Gleeson, USA TODAY Comments Off on Who is the 15-year-old who beat 39-year-old Venus Williams at Wimbledon? In her Grand Slam debut, Cori Gauff, 15, upset Venus Williams in the first round at Wimbledon on Monday. Gauff is the tournament's youngest player.