Zendaya lights up Monte Carlo semifinals with Challengers stars Mike Faist, Josh O’Connor

The stars came out in full force at the Rolex Monte-Carlo Masters to watch Jannik Sinner take on Stefanos Tsitsipas in the semifinals on Saturday—including another courtside cameo from Challengers star Zendaya.

The American is the star of Luca Guadagnino’s dark romantic comedy centered around tennis, with Zendaya playing Tashi, a former tennis prodigy-turned-coach. The 27-year-old has recently been trotting the globe as a part of her whirlwind promotional tour, from making a surprise appearance at the BNP Paribas Open finals alongside partner Tom Holland, to using fashion to make tennis references in events in Sydney and Rome.

In Monte Carlo, Zendaya arrived at Court Rainier III with co-stars Mike Faist, who plays Art, a tennis champion on a losing streak, and Josh O’Connor who plays Patrick, Tashi’s ex and Art’s former best friend. They joined a constellation of celebrities who have graced the stands in Monte Carlo this week, including Albert II the Prince of Monaco, and Formula 1 stars like Carlos Sainz, George Russell and Lando Norris.

The acting trio snapped photos on the balcony of the picturesque and historic tennis center, which overlooks the Bay of Monaco, before settling in to watch Australian Open champion Sinner take on two-time Monte Carlo champion Tsitsipas on center court.

In order to hone their own on-court skills, Zendaya, Faist and O’Connor trained for months with famed coach Brad Gilbert—who now works with US Open champion Coco Gauff—before filming.

“It’s not easy when you haven’t played and you’re supposed to be a pro,” Gilbert told Tennis.com’s Joel Drucker. “Zendaya and Josh (O’Connor) had never played. Mike (Faist) had played high school tennis. He’s a 4.0.”

“I love watching tennis, but I’m not very good on the court. But I learned lots (filming Challengers). It’s always nice learning a new skill,” O’Connor told PA news agency.

“I feel like as actors we get these opportunities to learn different skills and that’s always the nice thing. We’re sort of jack of all trades, masters of none.”

Challengers will hit theaters worldwide on April 26.