Serena Williams fires back at John McEnroe

Serena Williams has no interest in John McEnroe's thoughts on what would happen if she tried to play on the men's tennis tour. Williams tweeted to McEnroe: "I adore and respect you but "please please keep me out of your statements that are not factually based." The American has won 23 Grand Slam singles titles, a record in the Open era, which began in 1968.

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