Serena Williams has asked John McEnroe to respect her after he stated the 23-time Grand Slam champion would be "like 700" in the world tennis rankings if she played on the men's tour.
"If she played the men's circuit she'd be, like, 700 in the world," said McEnroe, while promoting his latest memoir But Seriously.
"That doesn't mean I don't think Serena is an incredible player, and I suppose anything's possible; maybe at some point a women's tennis player can be better than anybody.
"I just haven't seen that in any other sport, and I haven't seen it in tennis. If she had to just play the men's circuit, it would be an entirely different story."
Williams responded yesterday, stating: "Dear John, I adore and respect you but please please keep me out of your statements that are not factually based.