Maria Sharapova blasted Serena Williams on Saturday for the American's controversial comments over a high-profile rape case and even criticized the Wimbledon champion's colorful private life.

In an astonishing attack on the world number one, which comes just two days before Wimbledon gets underway, Sharapova told Williams to keep her opinions to herself as the bitter relationship between the two was laid bare.

Williams, the 16-time Grand Slam title-winner, was forced to apologize for her comments regarding the rape of a 16-year-old girl by two high school American football players in the Ohio town of Steubenville.