Japan's biggest tennis stars, Naomi Osaka and Kei Nishikori, spent the evening laughing and having fun together at a Houston Rockets vs. Toronto Raptors preseason basketball event in Tokyo.

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Osaka has admitted previously that she was intimidated by Nishikori because of his successful career But Osaka has since developed her own stardom, and over time, was able to not be so shy around the 29-year-old Nishikori.

The two are making a deep impact in Asia, staring in the same commercials, and playing together in exhibitions.

Osaka recently triumphed in two tournaments in Asia this month, claiming one in Osaka and the other in Beijing. Osaka is currently on a 10-match winning streak.

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WATCH: Osaka shares
funny video with
Nishikori

WATCH: Osaka shares funny video with Nishikori