Tennis superstars like Serena and Venus Williams, Naomi Osaka, and Kei Nishikori will participate in a celebrity Mario Tennis Aces tournament on Sunday at 4 p.m. ET. But wait ... there’s more!

They’re doubling up for partners tennis with celebrities like Gigi Hadid, Seal, Hailey Bieber, and Steve Aoki. Oh, and legendary tennis player John McEnroe is commentating the whole thing with Justine Ezarik, better known on YouTube as iJustine.

Called the Stay at Home Slam, the Mario Tennis Aces tournament will be broadcast on Facebook via Facebook Gaming’s own page or the IMG tennis page. (The tournament is a collaboration between talent management company IMG and Facebook Gaming.)

Here’s the full list of participants:

Serena Williams & Gigi Hadid

Naomi Osaka & Hailey Bieber

Venus Williams & DeAndre Hopkins

Maria Sharapova & Karlie Kloss

Kei Nishikori & Steve Aoki

Madison Keys & Seal

Taylor Fritz & Addison Rae

Kevin Anderson & Ryan Tannehill

Participants will play from their homes while partnered up in their matches. Everyone will get $25,000 to donate to a charity of their choice, with the winner receiving an addition $1 million to donate.

“Gaming’s superpower has always been bringing people together, and right now that’s the case more than ever,” said Leo Olebe, global director of games partnerships for Facebook Gaming. “Blending that superpower with pro athletes and epic entertainment to raise money for COVID-19 relief and research efforts is a natural fit that we’re proud to be a part of.”

Mario Tennis Aces is available on Nintendo Switch.

Switch Lite Nintendo Switch consoles are often sold out, but you can still pick up the handheld-only Switch Lite, which is perfect for portable gaming. link copy 2 Created with Sketch. Best Buy / $199.99 Buy