Tennis Star Naomi Osaka Says Her ‘Heart Dies Every Time’ She Loses [Video]

Tennis star Naomi Osaka is opening up about how she grapples with a loss.

After falling to Karolína Muchová on Thursday, Aug. 29, in the second round of the U.S. Open, Osaka revealed during a press conference after the match that she was “really disappointed. She described losing to Muchová as feeling like her “heart dies every time I lose,” per Sports Illustrated.

Despite her U.S. Open showing, Osaka still believes in her ability on the court and said she knows she can “win” — and is working hard to prove it.

Never miss a story — sign up for PEOPLE’s free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from celebrity news to compelling human interest stories.

“I’m working way harder than I’ve ever worked in my life, so it needs to turn into something. Well, it doesn’t ‘need’ to, but I think it …