Aryna Sabalenka was stuck in the biggest crisis of her tennis career 12 months ago, but the Belarusian big-hitter has found light at the end of a dark tunnel.
In a second-round win over Wang Xinyu at the 2022 Australian Open, Sabalenka served 19 double faults, and it was remarkable that she still pulled off the victory.
But it was no blip. In four matches, stretching from the 2021 WTA Finals to two tournaments in Adelaide at the beginning of the 2022 season, Sabalenka served a total of 74 double faults.
She considered it a success in round three at the Australian Open when she served 10 double faults against Marketa Vondrousova, such was the extent of her problem.
"I think it's more mental," Sabalenka said at the time, "because I put a lot of pressure on myself about my serve, and the last matches I was trying to control everything on my serve; my legs, my arm, the ball toss. And it was overthinking."
A year on, and Sabalenka is looking a different player, one that perhaps might finally be ready to win a singles grand slam.
That breakthrough might come this fortnight, with Sabalenka in scintillating form on Thursday as she beat Shelby Rogers 6-3 6-1 on Rod Laver Arena.
And here's the thing: she served three aces and not one double fault.
The yips have been cured.
"I worked a lot on my serve," said the 24-year-old after the Rogers match. "Like, really a lot. You can't even imagine how much I worked. I'm just super happy right now that everything is working.
"Oh, my God, I did almost everything to try to fix my serve. The whole year we were trying different things mentally, mental stuff, technique, technical, trying to breathe differently.
"I tried a lot. I watched a lot of different videos, from when I had no problems, when I had problems, trying to understand what is different."
Sabalenka had three double faults in her first-round win over Tereza Martincova, but three is fine, normal even. Zero in round two is something special.
The fifth seed will tackle Belgium's Elise Mertens on Saturday for a place in the last 16, knowing she managed to make it through to round four last year with a malfunctioning game.
The sky is the limit for Sabalenka if the serve is reliable. A three-time slam semi-finalist, her all-round numbers against Rogers were good, with 32 winners against 18 unforced errors a healthy ratio.
She reached the title match at the WTA Finals in November, a big moment at the end of a challenging year. Now a bigger goal is in her sights.