Australian Open champion Elena Rybakina crashed out in the biggest upset so far at Roland Garros.
The second-ranked Rybakina was beaten by 55th-ranked Ukrainian opponent Yuliia Starodubtseva 3-6, 6-1, 7-6 (4) in the second round of the French Open on Wednesday.
After a routine first set, the Kazakh player's errors far outpaced her winners as she toiled in the heat. Although she recovered to force a tiebreak, Starodubtseva completed the biggest win of her career.
Rybakina committed 71 unforced errors while falling to her earliest Grand Slam exit since a second-round loss at the 2024 US Open.
"It's just a pity because I think I was practicing well before the French Open and I was feeling also good in the practices and thought that I can raise the level," Rybakina said. "But actually today it was a very bad performance, too many unforced errors, and I didn't feel the greatest. So I was trying to find a way, but it clearly didn't work."
On a big day for Ukraine, also advancing were Elina Svitolina and Marta Kostyuk, who are coming off titles at the Madrid Open and Italian Open, respectively.
The seventh-seeded Svitolina beat Kaitlin Quevedo 6-0, 6-4 to extend her winning streak to eight matches. The 15th-seeded Kostyuk beat Katie Volynets 6-7 (4), 6-3, 6-3 to extend her winning streak to 13 matches.
Iga Swiatek improved her career record at Roland Garros to 42-3 by eliminating 35th-ranked Sara Bejlek 6-2, 6-3.
"Sometimes I had some moments where the mistakes happened, but at the end, I feel like I was the one that had control over the game, and it was up to me if I'm going to finish this points or make a mistake," Swiatek said. "In important moments, I was focused and patient enough to play solid."
Swiatek, a four-time French Open champion, next faces Magda Linette in the first all-Polish meeting at Roland Garros in the professional era (since 1968). Linette eliminated 2017 champion Jelena Ostapenko 6-2, 2-6, 6-2.
On Court 6, Hailey Baptiste was forced to retire while facing a set point against Wang Xiyu after landing awkwardly on her left leg. Also, 11th-seeded Belinda Bencic beat American Caty McNally 6-4, 6-0.
The Associated Press and PA contributed to this report.