Serena Williams' Number One Fan Is Definitely This Sassy Little Girl

Mimi, 3, claims her tennis skills are just as good as her idol Serena's.

— -- The Williams sisters’ showdown is the talk of the U.S. Open today, but no one is cheering louder than 3-year-old Mimi, who claims her tennis skills are just as good as those of her idol, Serena.

Game, set and match, feisty Mimi is totally winning the Internet right now with her viral stardom at more than 905,000 views and counting.

Her newfound fame has served up an ace surprise, too. Mimi and her family are getting free tickets from Chase Bank to attend the U.S. Open finals at Flushing Meadows in New York City.