Will Naomi Osaka retire from tennis?

After a surprise meltdown during her third round loss at the U.S. Open, Naomi Osaka admitted she’s taking a break from tennis, unsure when she’ll return.

Naomi Osaka suffered another shocking defeat, going out in the third round to 18-year-old Leylah Fernandez, 5-7, 7-6(2), 6-4, just a month after being defeated by Marketa Vondrousova in the same round at the Olympics. Considering that the four-time grand slam champion is the greatest women’s hard court player of our time and has never lost a grand slam final, the disappointments are real head-scratchers.

Even more disconcerting were the moments of frustration when Osaka threw her racquet three times, lobbed a ball in anger, and left the court draped in her towel without letting the umpire know. To say that these flashes of exasperation were out of character for the usually soft-spoken 23-year-old, is an understatement.

“I think I’m going to take a break from playing for a while,” Naomi Osaka said, tearfully, in her post-match press conference, according to The Guardian. “This is very hard to articulate. Basically, I feel like I’m kind of at this point where I’m trying to figure out what I want to do, and I honestly don’t know when I’m going to play my next tennis match. Sorry.”

Osaka has been vocal about the conversation on mental health dialogue and has been admired for using her voice to highlight social ills. But it’s clear that Naomi Osaka’s difficult comeback has taken a toll: Even wins don’t have the same satisfaction for the 23-year-old.

“I feel like for me, recently, when I win I don’t feel happy. I feel more like a relief. And then, when I lose, I feel very sad.”

Is this the end for Naomi Osaka? Let’s hope not, but only the two-time U.S. champ can tell.