Serena Williams 'Hates' The New Rules Surrounding Tennis

Williams had to return to the testing pool before she could announce her comeback to professional tennis and was asked Sunday about her experience with it.

It's safe to say that she doesn't like it.

Williams speaks out against new anti-doping rules

Williams made it clear that she's not a fan.

“It’s grueling. They changed the rules now. I didn’t know some of the rules. So apparently if you miss a test outside of your window, it still counts as missed. I’m like, I guess I can’t go pick up my kids,” Williams said. “It’s unprofessional. I hate it. I think it’s necessary, but I think a lot of the stuff, if I want to go places outside of my window, I should be able to go without having it count as a missed test.”

Williams made it clear that the new process was a reason why she almost didn't come back. Players now have to provide the International Tennis Integrity Agency with their daily whereabouts for no-notice testing.

“That was a big reason why I didn’t want to come back either,” she said, "because it’s just so hard. I mean, my life is busy, I run a company, I run a VC company, I travel the world. I have children. It’s like I could be in so many different cities so many different times.”