Iga Swiatek's troubled clay season took another painful turn on Saturday.
She was forced to retire in tears from her third-round match at the Madrid Open against American Ann Li, trailing 7-6(4), 2-6, 0-3 after calling for medical assistance on court.
The Polish world number four had battled through a tight opening set before finding her feet in the second, only for her body to give way in the decider. She fell a break down early in the third set, took a seat at the back of the court with her head in her hands, and requested the trainer.
A doctor arrived to check her vital signs and administered medication. She resumed play briefly but stopped again at 0-30 on her serve with Li leading 3-0, and retired from the match in tears.
"The past two days were pretty terrible, I think I have some virus," Swiatek said afterward.
"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."
It was her first mid-match retirement since she withdrew against Elena Rybakina in the Rome quarterfinal in 2023. For Li, it was a remarkable result: only her second career win over a top-10 player, and her first since defeating Anett Kontaveit at the 2022 Miami Open.
A clay season derailed before it has begun
The timing could hardly be worse for Swiatek. She arrived at the Madrid Open having made a promising start to the clay swing under new coach Francisco Roig, winning her opening match 6-1, 6-2 over Daria Snigur before illness struck in the following days.
"Before the tournament started, I felt like I was playing really well," she said.
"I was feeling very comfortable with my game and making progress. That was positive, but the tournament had barely begun for me, and today I couldn't even compete. It's disappointing. There aren't many positives to take away, to be honest."
The Stuttgart Open had offered some encouragement, but also a concerning result. Swiatek reached the quarterfinals there before losing to Mirra Andreeva for the first time in her career, a defeat that ended a run of nine consecutive wins over the Russian.
She is now without a title since the 2024 Roland Garros, a drought of nearly a year.
The ranking consequences of Saturday's retirement are significant. Swiatek was defending 390 points from her semifinal run in Madrid last year, when she lost heavily to Coco Gauff 6-1, 6-1. She will now drop 325 of those points, and could slip from fourth to third in the rankings depending on results elsewhere.
If Gauff reaches the final or Amanda Anisimova wins the title, Swiatek could fall further.
Roland Garros, which begins on May 24, is also a tournament where she has substantial points to defend. She won the title there in 2024, making her the top seed's position increasingly under threat if her results do not improve.
Swiatek said she will consult with her team about whether to compete in Rome before making any decision. The Italian Open runs from May 5 to 17 and represents the last significant preparation event before the French Open.
Despite everything, she was careful not to let the illness define the direction of her season.
"I was feeling very comfortable with my game," she reiterated.
"I was making progress in my process."