Six-times Grand Slam champion Iga Swiatek retired from her Madrid Open round-of-32 match against American Ann Li on Saturday due to illness, trailing 6-7(4) 6-2 0-3.
The fourth seed at the WTA 1000 clay-court tournament left the court in tears, having called for medical assistance during the match.
"The past two days were pretty terrible, I think I have some virus," said Swiatek, who won the Madrid title in 2024.
"It's been some hours fine, some hours pretty bad. I had zero energy, zero stability, and I just felt really bad physically.
"I knew that (it was) going to be hard but I still wanted to try because I already have been sick twice in my career and I could still win most of my matches. I guess it depends on how bad it is, and I guess this time it was worse than before."
Swiatek's withdrawal deals a blow to her preparations for the French Open, a tournament the Pole has dominated in recent years, winning the title four times, most recently in 2024.
Swiatek, 24, is expected to continue her build-up to Roland Garros at the Italian Open, which runs from May 5-17.
The French Open main draw gets underway on May 24.

Arsenal go back to top as Eze seals vital win
Sooryavanshi fastest to reach 1,000 runs in T20s
Man City fight back to beat Southampton in FA Cup
Tottenham, West Ham both win as battle to avoid relegation continues
Barcelona march on towards title with 2-0 victory at Getafe
