Serena Williams won her sixth Wimbledon women's singles final against Garbine Muguruza over the weekend, and Harry Potter author J.K. Rowling took to her Twitter account to tweet the athlete congratulations on a successful tournament. Then a troll entered.

A twitter user named "Rob" then tweeted at the author, "ironic then that main reason for her success is that she is built like a man."

Rowling was not having any of that and immediately shut the Twitter user down.

Rowling also shared two pictures of Williams in a curve hugging red dress, which she looked amazing in!

The tweet slamming Williams has since been deleted, Us Weekly reported. The tennis champion has not weighed in on the diss or Rowling's reaction. 

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