Serena Williams and Gigi Hadid are prepping for Sunday's Mario Tennis Aces tournament. The two stars are teaming up against seven other teams for a virtual battle on Nintendo Switch.

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"My doubles partner is Serena Williams, who is such a great friend and I'm her biggest fan," Hadid said on The Tonight Show Starring Jimmy Fallon.

Other teams include Hailey Bieber and Naomi Osaka, Karlie Kloss and Maria Sharapova, and Venus Williams and DeAndre Hopkins.

Hadid, who just announced that she's pregnant, is taking the tournament seriously.

“I’ve been practicing a lot because if anyone’s more competitive than me, it’s Serena,” Hadid said. “And, like, I cannot lose our friendship over [this], you know what I mean? We’re playing controller version but the first night I played, I practiced on swing mode and fully pulled my entire arm. Like, the next day, I couldn’t lift my arm. I couldn’t do anything.”

Hadid thinks Serena will pick Princess Peach while she'll go with Bowser or Yoshi.

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Who knew that injuries plagued gamers, too? All proceeds will benefit COVID-19 relief efforts, and if they win, Hadid pledged to donate $1 million to Feeding America.