Juan Martîn del Potro and Serena Williams were the winners at the BNP Paribas Showdown at Madison Square Garden on Monday, and Ben Stiller could not be serious with his tennis skills.

The highlight of the night was an impromptu doubles matchup when Stiller joined Rafael Nadal to face Del Potro and a middle school girl from the stands.

Naturally, the girl was a prodigy and overwhelmed an outclassed Stiller.

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