Don't mess with Serena Williams.
Williams shared a story about chasing down a man who apparently stole her cell phone on Tuesday night.
Williams spotted the suspicious man who was standing close to her during dinner at a Chinese restaurant.
"Than when least expected, low and behold this common petty thief grabbed my phone and swiftly left," Williams wrote. "I looked at the chair, than shouted 'Omg that dude took my phone!!'"
That's when her "Superhero" sense kicked in. Here's the full story: