No. 10 seed Karolina Muchova defeated Naomi Osaka 7-6 (4), 6-4 on Tuesday to reach her first Wimbledon semifinal.
The 14th-seeded Osaka, who knocked out world No. 1-ranked Aryna Sabalenka in the previous round, entered the day as the only player in the men's or women's draw who had yet to drop a set.
After being broken twice in 37 games over her first four matches, Osaka was broken twice in the first set alone. She committed four double faults and had 32 unforced errors for the match, both her most this tournament.
"It's hard because I played so well in my last match, then today I just feel like I didn't play well at all and I didn't have any energy," said Osaka, who despite the loss still had her best result at the All England Club by reaching the quarterfinals.
"I could feel it coming because I've played way more matches than I usually do before a Slam," she added. "I just wanted to try that to see the rhythm, you know? Obviously, it worked out well. But I think I probably won't do that again. But yeah, I would say it was like an accumulation of playing two weeks straight without a day off."
It was a rematch of the Bad Homburg final, which Muchova won after Osaka, 28, retired in the second set because of a foot injury.
The Japanese player -- who took mental health breaks starting in 2021 and was away from the tour while having a daughter -- was asked Tuesday if she has an ankle issue. No, she responded before joking about "getting old." She did say, however, that she has "plantar fasciitis on my feet. Well, that's what we assume it is."
"It kind of started happening offseason last year," Osaka added. "I feel like maybe it's because I'm a lot more springy on my toes. I think it reactivated on grass court because I'm pushing off a lot more to go forward. I don't think it will bother me on hard court. I'm thinking it was maybe just the surface change."
Before this year, Muchova hadn't won a title since Seoul in 2019, which was the first of her career. She won the WTA 1000 event in Doha in February and then Bad Homburg, a grass-court tuneup for Wimbledon. The Czech, 29, has won nine straight matches -- all on grass -- dating to the start of that Bad Homburg title run, which breaks a tie for the longest tour-level win streak of her career (previous was eight straight earlier this year spanning her Doha title and Indian Wells).
"It's unbelievable -- I'm super happy with today's win," Muchova said in her interview from No. 1 Court. "I played three times on this court and it was 0-3. I had a not good relationship with this court, but I am super happy we finally made it and I got the win."
Osaka fell to 5-1 in Grand Slam quarterfinal matches; only Chris Evert (48) and Sabalenka (eight) had longer win streaks in major quarters to start their careers.
Osaka has won two of her four major titles (2018 and 2020) at the US Open, and she made it back to the semifinals at Flushing Meadows last year, losing to Amanda Anisimova.
"I feel like in my head I think there's still an opportunity to win a Slam," she said.
Muchova, the 2023 French Open runner-up, has now reached the semifinal round at all four majors. Entering the day, she was 0-2 in previous Wimbledon quarterfinal matches, in 2021 and 2019.
She will play seventh-seeded American Coco Gauff on Thursday for a spot in Saturday's final. Gauff leads 6-1 in their tour-level matches, though Muchova won their most recent meeting in Stuttgart in April.
ESPN Research, The Associated Press and PA contributed to this report.