Paula Badosa was forced to withdraw from her quarter-final against Marketa Vondrousova and taken from the court on a wheelchair after suffering from heatstroke at Tokyo 2020.
Tuesday saw heavy downpours in the Japanese capital, but the hot and humid conditions from earlier in the week returned early on Wednesday with temperatures at times going above 30 degrees Celsius.
Vondrousova, who had shocked home favourite Naomi Osaka in the previous round, won the first set 6-3 at Ariake Tennis Park but her opponent was clearly struggling as she prepared to play the second set.
She required medical assistance to depart the court, as Vondrousova progressed to the final four.
VONDROUSOVA COMMENTS ON THE HEAT
The conditions for the tennis in Tokyo have been a quite literal hot topic with both Daniil Medvedev and Novak Djokovic stating matches should start at 3pm so the majority can be played as temperatures cool.
Vondrousova explained how it was playing in the searing heat, saying: "It was a big struggle from the beginning.
"I warmed up in the morning and I felt it was really hot and humid. Also, I was a bit tired from yesterday because I had doubles too.
"But I knew she had too [singles and doubles]. I felt like we both were struggling from the beginning.
"I was just thinking, you have to stay there mentally, just fight for every point and just see what happens. It's good for me that I can have some rest now.
"It's all about the head too. You have to stay there mentally and fight. Even when you lose the point, you have to get up and fight again. It's really a struggle here with the weather, but that's it, we have to fight."
OLYMPICS LIKE A SLAM FOR SVITOLINA
Next up for Vondrousova is a last-four meeting with Elina Svitolina, the fourth seed and highest-ranked player left in the women's draw.
The Ukrainian was a 6-4 6-4 victor over Camila Giorgi and talked up the significance of winning Olympic gold.
"I know that for Ukraine, [the Olympics] is a really big thing," Svitolina said.
"I value the Olympics as a grand slam, and I tried to prepare to bring my best tennis. Here I am in the semi-final, and I can get a chance to get a medal. It's very special for me, but I try to take one match at a time."
Belinda Bencic (9) came through 6-0 3-6 6-3 against Anastasia Pavlyuchenkova on the other side of the draw. She will face Elena Rybakina (15), who was too good for seventh seed Garbine Muguruza in a 7-5 6-1 win.
Ash Barty was beaten along with partner Storm Sanders in the women's doubles quarter-finals earlier on Wednesday but the world number one bounced back to win her first-round mixed doubles match with partner John Peers.
The Australian duo beat Argentina's Horacio Zeballos and Nadia Podoroska 6-1 7-6 (7-3).
Rybakina saves two match points to beat Putintseva in Madrid Open quarter-finals
Elena Rybakina saved two match points as she outlasted Yulia Putintseva to win a dramatic encounter 4-6 7-6 (7-4) 7-5 in the Madrid Open quarter-finals on Wednesday.
The world number four was on the brink of defeat at 5-2 down in the third set, with her fellow Kazakhstani Putintseva eyeing a third win in as many head-to-head meetings between the pair.
However, Rybakina came up with one of the shots of the tournament on Putintseva's first match point, capitalising on a drop shot clipping the net cord to produce a nonchalant winner.
The 2022 Wimbledon champion didn't look back from that moment on, producing back-to-back breaks before holding her nerve through a tense final service game, converting her fourth match point to wrap up a gruelling two-hour, 48-minute contest.
Rybakina has now won 16 successive matches on clay, and she will face either Aryna Sabalenka or Mirra Andreeva in the semi-finals on Thursday.
Data Debrief: Rybakina rampant
Rybakina is the form player on the WTA circuit, with Wednesday's win her 30th of 2024, more than any other player.
She is just the second player to win 30 or more matches in tournaments starting within the first four months of a calendar year, after Iga Swiatek managed 32 victories during the same span in 2022. Swiatek, of course, went on to win the French Open and US Open titles that season.
'I cannot thank you enough' - Nadal salutes supporters after Madrid Open farewell
Rafael Nadal paid tribute to supporters after his farewell appearance at the Madrid Open ended following defeat to Jiri Lehecka in the last 16.
The 22-time grand slam champion bowed out after going down in straight sets against his Czech opponent, who prevailed 7-5 6-4 to set up a quarter-final clash with Daniil Medvedev.
Nadal was honoured following the conclusion of the final match at his home ATP Masters event, where he triumphed in 2008, 2010, 2013, 2014 and 2017.
Five banners to represent each of his titles were unfurled, displaying the message 'Gracias Rafa', while he was also presented with a trophy by tournament CEO Gerard Tsobanian and director Feliciano Lopez.
"It's been a very special week for me, very positive in many ways, both personally and for my tennis," he said during his on-court interview.
"I had the chance to play again on court. A few weeks ago, two days before Barcelona, I didn’t know if I would compete in an official match again, and I've now played two weeks. It's been unforgettable.
"This is one of those days that when it arrives, it's very tough, but life and my body have been sending me signals for a long time.
"The only thing I can say is thank you. It's been an incredible journey that started when I was little. I came to Madrid for the first time in 2003, when the tournament was played indoors.
"The first time I came here feeling competitive was in 2005. It was one of the most exciting wins of my career. Ever since, the support has been unconditional from everyone. I cannot thank you enough.
"Even though it's not over, this is the last time I'll be in Madrid. You have given me a gift for the last 21 years that's more significant than any Grand Slam I have won. The emotions of playing in Madrid, in front of the Spanish fans, is something that will stay with me forever."
Swiatek admits she would swap shirts with 'huge inspiration' Nadal
Iga Swiatek admits that, like Pedro Cachin, she would also swap shirts with Rafael Nadal following his Madrid Open exit.
The 22-time grand slam champion's farewell appearance at the clay-court ATP Masters tournament, which he has won five times, was ended by a straight-sets defeat to Jiri Lehecka.
Nadal had beaten Cachin in the last 32, with the Argentine subsequently asking his idol for his shirt as a memento following their clash.
Although Swiatek has never been tempted to follow suit with an opponent, the world number one acknowledged she might make an exception for the Spaniard.
"If I would play against Rafa, for sure I would ask for a T-shirt," she laughed.
"For sure, he was a huge inspiration. When I was younger, he was basically the only player I looked up to, but not because of his game on clay - more because of the way he is off the court and how he never gives up, and also his mentality."
Swiatek is through to the semi-finals in the ladies' draw after recovering from losing the opening set to defeat Beatriz Haddad Maia 4-6 6-0 6-2.
The Pole, who will play former US Open runner-up Madison Keys in the last four, equalled Serena Williams and Maria Sharapova as the fastest player to reach 25 WTA 1000 wins on clay, doing so in just 29 matches.
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