Stefanos Tsitsipas crashed out of the Miami Open at the quarter-final stage as Hubert Hurkacz came from behind to win 2-6, 6-3, 6-4.
"I was very stressed these two weeks," the Greek admitted after the match.
"Especially this week I was feeling very stressed. I felt like it was my opportunity.
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I did quite well, but I feel like there was more space for me to show something greater. It's a disappointing loss. It's a very disappointing loss. It left out of my hands. I grabbed it. It was there. Everything was under control. And suddenly, I don't know, self-explosion!"
Tsitsipas seemed to be coasting, leading 6-2, 2-0, and with game point, but the 22-year-old crumbled and he proceeded to allow a rapidly improving Hurkacz back into it.
That included a break of serve - where Tsitsipas had been 40-0 up on his own racquet.
And the second seed was broken in exactly the same way in the final set, gifting the Pole the lead.
Tsitsipas had got himself into further trouble just before the final set, receiving a time violation after taking too long to change his shirt and sweatbands.
Father Apostolos, who is also his coach, seemed to be sarcastically applauding the umpire as he called the supervisor to court on Tsitsipas's request.
Hurkacz will face Andrey Rublev in the semi-finals while Roberto Bautista Agut faces Jannik Sinner in the other semi.

Rublev battles past Korda

Rublev produced a gritty 7-5, 7-6(7) win over Sebastian Korda in one hour and 39 minutes to go within two victories of a maiden Masters title.
The Russian fourth seed put an end to Korda's remarkable run which saw the world number 64 knock out Fabio Fognini and Diego Schwartzman.
After Rublev grabbed the first set against the 20-year-old, a Korda double fault ultimately presented him the chance to seal it at the third time of asking and he took it.
Rublev is wary of how tricky an opponent Hurkacz could be when they meet in Friday's semi-final.
"I know how tough Hurkacz is, for example, he beat me last year," Rublev said on-court afterwards.

Highlights: Rublev battles past Korda to reach semi-finals

"It's more about that maybe I feel extra pressure, because I'm the one left [from the] Top 10 and looks like I'm high ranking and I feel more pressure.
"But I lost to Hurkacz, I lost to Roberto [Bautista Agut] 6-3, 6-3 just two weeks ago.
"Jannik [Sinner], who is beating already many players, and I think he [has beaten] Top 10 players also... So in the end, everyone can win now."

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