Stronger At 33, Serena Williams is the oldest female world number one in the history of tennis. Her fierce forehand and unstoppable service (206 km/h) have allowed her to achieve what Roger Federer could not: to add an Olympic singles title to victories at Wimbledon and other Grand Slam tournaments. For Richard Williams, her father and mentor, “it’s all in the mind, because the body obeys the mind. The mental aspect is what makes the difference between a player and a champion.” Puma tennis outfit worn by Serena WILLIAMS (USA), Olympic doubles champion at Sydney in 2000, Beijing in 2008 and London in 2012, and Olympic singles champion at the London 2012 Games You have to believe in yourself when no one else does.