The Mexican Open in Acapulco is known for having some of the most fun pre-tournament events on tour: Last year, SpongeBob Squarepants made an appearance alongside Rafael Nadal, and this time, "Despacito" singer Luis Fonsi came out to play.

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Fonsi tested his tennis skills at Sunday's the Desert Smash event, alongside Stan Wawrinka and fellow Puerto Rican star Monica Puig.

He even sang his No. 1 hit a-cappella for the crowd:

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Also, at the tournament's Kids' Day, children got to hit the court with Nick Kyrgios ...

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Steve Johnson ...

John Millman ...

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Maria Sakkari and more:

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The stars of these events have fared well in Acapulco so far, with Nadal and Kyrgios set to meet in the second round, on Wednesday, and Puig scoring a three-set upset over No. 6 seed Sakkari.