Tough stuff! Serena Williams totally took down a phone thief last night

Think Serena Williams is a softie at heart? Think again.

The tennis pro was out for a dinner with her fellow sports star Caroline Wozniacki last night, when she suddenly found herself chasing down a phone thief… and winning.

Taking to Facebook this afternoon, the US Open champ explained how she knew something wasn't right when a strange man spent a little too long lingering by her table.

"So this guy is standing next to me and something (I have now dubbed it my SUPERHERO sense) told me to watch him," she wrote. 

"My phone was sitting in the chair but I just didn't feel right. He was there too long."

Needless to say, Serena's "superhero sense" was indeed correct, and the man proceeded to grab her phone, obviously not knowing who exactly he was messing with.

"He began to run but I was too fast. (Those sprints came in handy) I was upon him in a flash," she told her followers today.

"In the most menacing yet calm no nonsense voice I could muster I kindly asked him if he 'accidentally' took the wrong phone.

"He stumbled on his words… eventually he said 'Gosh you know what I did! It was so confusing in there. I must have grabbed the wrong phone.'"

After relieving the thief of his stolen goods, Serena said she walked back into the restaurant to a "standing ovation" from the other diners.

Signing off, the tennis star urged other women to "not be a victim but a hero."

That's advice for life right there.