Photo Credit:morguefile.com

J.K. Rowling is a huge Serena Williams fan!

Prior to Williams’ big Wimbledon win on Saturday, Rowling posted a photo of the two of them on Twitter, announcing her support for the tennis pro.

“I’m #TeamSerena today, because you don’t meet many super-talented people nicer than she is. Go @serenawilliams!” the Harry Potter author wrote in the caption.

Throughout Williams’ final match against Garbiñe Muguruza, Rowling cheered her on in Twitter posts.

“#SerenaSlam! I love her. What an athlete, what a role model, what a woman!” Rowling posted.

Unfortunately, like any person in the public eye, Williams has her share of haters.

“@jk_rowling @hansmollman ironic then that the main reason for her success is that she’s built like a man,” a Twitter user posted in response to Rowling’s last tweet.

J.K. was not about to let anyone diss her champion pal.

The author posted a stunning photo of Williams in a red dress in response, the the caption: “@diegtristan8 ‘she is built like a man’. Yeah, my husband looks just like this in a dress. You’re an idiot.”

BAM.

While J.K. Rowling was busy putting this hateful Twitter user in his place, Serena Williams was busy winning her 21^st Grand Slam title.

Team Rowling/Williams-1

Haters-0