There is no bigger tennis fan than J.K. Rowling, as her epic Twitter rant about Wimbledon proves.

Believe it or not, but Comic-Con isn’t the only big cultural event taking place this weekend.

Wimbledon 2015 has reached its final stages, and at Saturday’s Ladies Final, Serena Williams won her sixth singles title, completing the “Serena Slam” (four straight majors) for the second time in her career.

Williams bested 21-year-old Garbine Muguruza 6-4 6-4, and despite her obvious disappointment, the young Spaniard was quick to congratulate Williams on her victory.

“I want to (congratulate) Serena who is showing us she is world No. 1,” Muguruza said when speaking to the press after the match (via CNN).

The match itself was intense and exciting, if you’re into tennis. If you’re not, you may instead have been watching J.K. Rowling’s twitter feed.

The Harry Potter author has never been shy about her love of tennis, and, continuing her Twitter-winning streak, decided to live-tweet the experience of watching Serena Williams’ game:

Although J.K. Rowling is obviously Team Serena, Muguruza clearly managed to win her over with her outstanding performance.

“Turns out Muguruza is adorable,” Rowling wrote of the “unbelievable” young player. “I’ll be supporting her whenever she’s not playing @serenawilliams or @HeatherWatson92.”

Rowling even posed for a picture with Williams, and clearly has nothing but good things to say about the 33-year-old athlete:

Also, because she’s the best, J.K. Rowling decided to take a hater who said Williams was “built like a man” to task:

Congratulations to Serena Williams on her victory — and to Jo, who clearly had a good Saturday afternoon!