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Surveillance video captured the moment a foolish thief tried to steal Serena Williams' cell phone and was caught when the tennis ace sprinted after him.

Williams shared the story of her superhero move on Facebook Wednesday, saying she was out to dinner with a friend when a man came over and stood silently next to her at the table.

Now, video taken from inside and outside the San Francisco restaurant - where Williams was dining with a male friend who appeared to be Reddit founder Alexis Ohanion - shows just what happened next when the athlete turned vigilante sprung into action after the man snatched her phone.