Iga Swiatek blamed a gruelling recent schedule after her French Open defence ended in a shock quarter-final defeat to Maria Sakkari.
The Pole came into Wednesday's last eight match having won her last 22 sets at Roland Garros, but lost 6-4 6-4 to the competition's 17th seed.
Swiatek headed to Paris full of confidence after winning on clay in Rome two weeks prior, and she had also helped Bethanie Mattek-Sands into the semi-finals of this year's doubles.
However, the world number nine believes she may have paid the price for all that tennis in the form of a lacklustre display against Sakkari.
She said: "Well, obviously I didn't play my best tennis. That's for sure. But Maria did a good job with playing at my forehand, which wasn't working pretty well today.
"It's good for her that she saw that. She picked good tactics, for sure. I struggled with picking the right place where to play. I couldn't play some shots that usually give me points.
"Yeah, my balls weren't, like, really deep and heavy. Basically that's my biggest weapon, so it was really hard to play without that.
"Also, you know, I think, like, past couple weeks hit me kind of yesterday. I just didn't have good days, I couldn't do like physical recovery well because I was stressed. Days like that happen, and it's normal."
Swiatek left the court for treatment on her thigh after losing the first set, but she refused to blame that issue for her defeat.
She added: "Right now I know it's nothing serious. When I was on court, I felt it totally differently. As I said, I couldn't even sleep well yesterday. I slept like a few hours.
"I think I was feeling everything twice as much as I should. It was hard to rationally just see what's going on. I made the decision to tape it just to feel sure [to give] me, like, a little bit more confidence when I was moving.
"Still my reaction was bad. I didn't play well, like, tactically and also technically. I was on my heels, so it's hard to make something of that kind of game."
Sakkari, meanwhile, revealed that her commitment to simply enjoying Wednesday's match helped her secure a maiden Grand Slam semi-final berth.
She said: "I'm speechless - it is a dream come true. It is a very nice feeling, I couldn't have done it without my team and their support so I want to thank them.
"We still have a long way to go of course [if we want to win the tournament] but we made a huge step.
"I'm not going to tell you the game plan of course because we will play again [against Swiatek] for sure! So I'm not gonna say our little secrets!
"But I really enjoyed it. Before coming into the match I just sat down and spoke to myself and said it is a very important match but just enjoy it - playing at one of the best stadiums in the world. So I have enjoyed it."
Greece boasts two semi-finalists in this year's French Open after Stefanos Tsitsipas also progressed to the last four of the men's draw.
And Sakkari believes the sport may even have overtaken football and basketball in terms of popularity back in her homeland.
She continued: "Now it's probably the biggest sport these days. Football is over. Basketball is over. So tennis is in the spotlight.
"Yeah, with Stefanos, I mean, we're very close. We know each other since a very young age. I mean, I see him every day here. We're actually having dinner with our teams next to each other every night.
"I'm very, very happy for him and his family. It's very exciting times for Greek tennis."
World number one Swiatek sees off Xiyu in Madrid opener
World number one Iga Swiatek overcame Wang Xiyu with the minimum of fuss on Thursday to progress to the third round of the Madrid Open.
Swiatek has yet to win the title in Madrid, which is the only clay-court European event at which the Pole has not triumphed, but she got off to a flying start with a 6-1 6-4 victory over Xiyu.
"I love this place. I got to know the city a little better last year," Swiatek said. "So this time I feel more comfortable around."
Next up for the 22-year-old is a third-round tie against 27th seed Sorana Cirstea on Saturday.
Data Debrief
Swiatek has registered 150 match wins on the WTA Tour since the start of 2022. Elena Rybakina and Coco Gauff are the next best with 108 wins each.
She also became the first player born this century to claim 50 combined match wins in Madrid, Rome and Roland-Garros, since the inaugural women's singles event at the Madrid Open in 2009.
Dominant Gauff double bagels Rus at Madrid Open
Coco Gauff made a flying start to her Madrid Open campaign on Thursday, recording the first double bagel main-draw win of her career as she cruised past Arantxa Rus to reach the round of 32.
Gauff needed just 51 minutes to see off 33-year-old Rus as she booked a meeting with Ukraine's Dayana Yamstremska for Saturday.
The US Open champion lost just 18 points throughout the match – eight in the opener and 10 in the second set – as she put any doubts over her recent form to bed in emphatic fashion.
Gauff's power proved too much for Rus in the opener, the third seed winning 88 per cent of points behind her first serve and converting three of four break points to go a set up in just 23 minutes.
Rus brought up four break points midway through the second set, but when she failed to convert them, Gauff punished her in ruthless fashion by reeling off another three games then finishing things with a terrific forehand winner.
Speaking after her win, the American said: "I played really well today. It was just one of those days for me… 6-0 6-0, I've never done that before, I'll probably never do it again."
Data Debrief: Gauff matches Azarenka, Halep feat
Gauff is just the third player to register a 6-0 6-0 win in the women's singles draw at the Madrid Open, following in the footsteps of two former world number ones in Victoria Azarenka and Simona Halep.
The American, who only turned 20 last month, is also the youngest player to double bagel an opponent in any main-draw match on the WTA Tour since Iga Swiatek did so against Karolina Pliskova in the 2021 Italian Open final in Rome.
Nadal cruises past teen Blanch to tee up De Minaur rematch in Madrid
Darwin Blanch presented little challenge for Rafael Nadal, who dropped just one game in a convincing 6-1 6-0 triumph at the Madrid Open.
Nadal is feeling his way back to fitness, but 16-year-old qualifier Blanch offered little resistance to the 22-time major champion on Thursday.
Making his farewell appearance at the Madrid Open, where he has won five titles, Nadal needed just 64 minutes to progress to round two.
"I think today I played against an opponent with a great future in front [of him], but today, still making mistakes," said Nadal.
"I just tried to be there, be solid all the time without taking a lot of risks. It worked well. I'm happy to be through and I wish him all the very best for the future."
Nadal's reward is a rematch with Alex de Minaur, who he lost to last week in Barcelona.
Data Debrief
This game saw the largest age gap (21 years, 117 days) between two opponents in the history of ATP Masters 1000 events.
Nadal has now registered 57 wins at the Madrid Open, which is 20 clear of any other player.
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