Marta Kostyuk is making waves both on and off the court. The 24-year-old Ukrainian tennis star, currently ranked No. 11 in the world, has been enjoying a career-defining season, and she's not slowing down—even during her downtime.
On the eve of the National Bank Open in Toronto, Kostyuk took to Instagram to share a steamy snapshot from the sauna, sporting a sleek black swimsuit. The photo, captioned "I love this place and it's not an ad," quickly caught fire on social media, showing fans that the tennis sensation knows how to relax in style.
Kostyuk's 2026 campaign has been nothing short of spectacular. She clinched her first WTA 1000 title at the Madrid Open, then stormed to the semifinals at both Roland Garros and Wimbledon. In each of those Grand Slam semifinal losses, she fell to the eventual champion—Mirra Andreeva in Paris and Linda Noskova in London—proving she's been right at the edge of greatness.
Reflecting on her breakthrough run, Kostyuk said after Wimbledon, "I'm the most happy with the freedom that I gave myself to try different things on the court and just play tennis again. Grass was not my best surface. But I'm super happy with how I deal with the losses. It's one thing to talk about it but once you lose, it's how you deal with it. I want to cherish this moment and appreciate how far we've all come, me and my team."
That newfound confidence is a key reason why many are eyeing Kostyuk as a serious threat at the upcoming US Open. Her hard-court credentials are solid—she reached the fourth round in Flushing Meadows last year and made the final in Brisbane earlier this season. Now, with a full season of momentum behind her, she's ready to make a deep run.
Kostyuk's sauna snap is just the latest in a string of bold social media moments from tennis stars. She joins the likes of Aryna Sabalenka's pre-Toronto swimsuit reveal and Danica Patrick's stunning European swimsuit shot in turning heads before the hard-court season heats up.
With the US Open just around the corner, Kostyuk is currently tied for the ninth-best odds to lift the trophy. While she's still chasing her first Grand Slam title, her recent form and fearless mindset make her a dangerous opponent for anyone in the draw.
As she steps onto the Toronto courts this week, Kostyuk will look to carry that same swagger from the sauna into her matches. If her social media game is any indication, she's feeling relaxed, confident, and ready to make some noise.
