Four-time champion Iga Swiatek was knocked out of the French Open on her 25th birthday, losing her fourth-round match in straight sets to in-form Marta Kostyuk.
Polish third seed Swiatek was plagued by inconsistencies as Ukrainian 15th seed Kostyuk won 7-5 6-1 on Court Philippe Chatrier.
Swiatek is nicknamed the "Queen of Clay" having won four titles at Roland Garros, but has not won a title on the surface since her most recent triumph in Paris in 2024.
The six-time Grand Slam champion, who will start the defence of her Wimbledon title at the end of June, is yet to win a a tournament in 2026.
In contrast, Kostyuk entered the French Open undefeated on clay in 2026 having won titles at the Madrid Open earlier this month and the Rouen Open in April.
"I'm still in shock to beat such an unbelievable player who won four times here," said Kostyuk.
"I feel like I've given myself more space to just create something, to challenge my opponents. I woke up in the morning and all I thought was 'what an unbelievable day I have to live today... there's nothing I could do other than this'."
Kostyuk will play fellow Ukrainian Elina Svitolina in the quarter-finals after the seventh seed's 4-6 6-4 6-0 win over Switzerland's Belinda Bencic.
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There was little to separate the duo in the first set as they twice traded breaks, before Kostyuk took control at the end.
The brilliance of Swiatek's strokeplay was on display when returning against Kostyuk but unforced errors hampered her serve as two double faults gave the Ukrainian the advantage before she won the opening set with a fine backhand winner.
Kostyuk had not taken a set off Swiatek in their three previous tour-level meetings and the 23-year-old's confidence grew as she tightened her grip on the match.
Her powerful groundstrokes continued to wear Swiatek down as she ran away with the second set to reach the last eight at Roland Garros for the first time, while it is the first time that Swiatek has failed to reach the quarter-final at the French Open since her debut in 2019.
Swiatek's defeat comes amid a spell of big names exiting the men's and women's draws at Roland Garros.
Men's world number one Jannik Sinner, 24-times Grand Slam winner Novak Djokovic and defending women's champion Coco Gauff have all gone out of the event in recent days.
Cirstea back in French Open last eight after 17 years
Meanwhile, Romanian 18th seed Sorana Cirstea is into her second French Open quarter-final - 17 years after her first appearance in the last eight at Roland Garros.
The 36-year-old, who plans to retire at the end of the year, was a 6-3 7-6 (7-4) winner against Chinese qualifier Wang Xiyu.
The victory continues Cirstea's remarkable form in the twilight of her career. following her 6-0 6-0 victory over Solano Sierra in the third round.
Cirstea said her final year in the sport is "going way better than I expected" but, at the moment, she is not planning to reverse her decision to retire.
"I'm just trying to take it week by week and I'm not going to do anything different," said Cirstea. "I'm not going to try now to change things or put any pressure.
"Of course, we will assess things as we go, but at the moment the decision is the same."
Cirstea beat world number one Aryna Sabalenka in Rome earlier this month, while her run at Roland Garros is her best at a Grand Slam since reaching the US Open quarter-finals in 2023.
She said she is "more mature" at the age of 36 compared to the early stages of her career and has a "different kind of perspective and mindset".
She added: "I think when I was really young, it was a little bit of life or death every single match. I would win, I was very, very happy. I would lose, [for] two days I would be crying.
"I have so much passion for the sport. I have so much joy playing, but at the same time, it's my job."
Cirstea will next play the winner of the fourth-round match between Russian eighth seed Mirra Andreeva and unseeded Swiss Jil Teichmann.
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