When will people learn it's a bad idea to come for Serena Williams?Watch Taboo Family Online

Outspoken former tennis star John McEnroe said in an interview with NPR on Sunday that Williams would be "like number 700 in the world" if she played on the men's tennis circuit.

Williams, who is currently pregnant, wasted no time putting McEnroe in check on Monday afternoon.

First with the forehand:

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And then with the backhand:

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Game, set, match, as they say.