Serena Williams congratulates 'forever friend' Maria Sharapova on Hall of Fame induction – video

Serena Williams made a a surprise appearance at the International Tennis Hall of Fame ceremony in Newport, Rhode Island, emerging from behind the stage to introduce 'former rival, former fan and forever friend' Maria Sharapova for her induction on Saturday night. 'My favourite moments were always the quiet victories,' Sharapova told the audience. 'In giving my life to tennis, tennis gave me a remarkable life.'

• Sharapova enters tennis Hall of Fame with surprise cameo by Serena Williams