The BNP Paribas Tennis Showdown was just held in Manhattan, New York City. Just for fun, professional tennis player Rafael Nadal asked celebrity in the stands Ben Stiller to join him for a few volleys while playing Juan Martin Del Potro.

Juan also picked a fan from the fans as his teammate. A random little girl. Viewers expected the audience to side with the little girl, but no one expected her to perform so well. 

The adorable match was caught on camera by Romi Cvitkovic, and now the video is going viral.