Iga Swiatek's 25th birthday celebrations turned sour at the French Open on Sunday as the former champion lost 7-5 6-1 to Ukrainian 15th seed Marta Kostyuk. The four-time champion's bid for a fifth title ended in the fourth round, marking a rare loss of control for Swiatek, who stated that tension got the better of her. Kostyuk reached the quarterfinals for the first time by defeating the third-seeded Pole in straight sets.
With Swiatek's exit, there are no former champions left at Roland Garros in either the men's or the women's draws. Kostyuk, who remains unbeaten on clay this season with a 15-0 record, will now face either seventh-seeded Ukrainian Elina Svitolina or 11th-seeded Swiss Belinda Bencic in the next round.
The defeat followed the ouster of defending champion Coco Gauff, who saw her title defense end in the third round. Gauff lost to Austria's Anastasia Potapova 4-6 7-6(1) 6-4. Potapova advanced to the fourth round after Gauff struggled to find her best level against a player who could match her court coverage in long baseline rallies.
These results reflect a brutal start to the second week as top seeds continue to fall. In the men's draw, Jannik Sinner and Novak Djokovic have also crashed out, leaving world number one Sabalenka as one of the top remaining contenders for the women's title.