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."