Maria Sharapova responds to Serena Williams quotes

Maria Sharapova believes rival Serena Williams should not comment on matters outside of tennis as she criticised the American ahead of Wimbledon.

Defending Wimbledon champion Williams was forced to apologise for what she was reported to have said about the rape of a 16-year-old girl in Ohio.

"I was sad to hear what she had to say about the whole case," Sharapova said.