Belinda Bencic is being generous, self-aware and a little bit savage. Instead of donating to the Australian fire relief efforts per ace hit (like most of her peers are doing), Bencic, struggling with her second serve, will $200 per double fault.

At the end of her Instagram post she calls out Alexander Zverev, who has recently forgotten how to serve, to join her.

The Swiss has hit 27 double faults compared to 20 aces in her last five matches. Zverev, on the other hand, has been struggling even more. If Zverev had pledged $200 per double fault at the ATP Cup, he would have donated $6,200 for his 31 double faults in Brisbane.

Bencic isn't the only player coming up with creative ways to give, as Alize Cornet and Simona Halep are not relying on their serves.

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Bencic is also not the first to call an ATP player out, as Maria Sharapova gave Novak Djokovic a challenge, which he quickly responded to.

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The Australian Open is hosting a Rally for Relief charity mach on January 15, with Roger Federer, Rafael Nadal, Serena Williams, Nick Kyrgios and many more committed.