In the latest of a series of friendly player-coach wagers, Naomi Osaka had to dance in the middle of a crowded Tokyo intersection after losing to Sascha Bajin in mini-tennis.

"I can't do this anymore," the Indian Wells champion said after nine seconds of embarrassment.

Other bets between the recently formed and quickly successful partnership include push-ups and food.

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But, to keep things interesting, Bajin is now crowdsourcing punishments on Twitter, so keep an eye out for whatever's coming next.

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Osaka has risen 46 spots in the rankings in 2018 to No. 22, and is now No. 6 in the Race to Singapore.

She's nominated for this weekend's Fed Cup tie between Japan and Great Britain, which is set to also feature Kurumi Nara, Johanna Konta and Heather Watson.