Serena Williams has dropped out of the Indian Wells tournament without completing her first match because of some viral illness.
It was her first tournament since the Australian Open.
But it came to an abrupt end on Sunday as the ailing 23-time Grand Slam champion retired from her third-round WTA match against Garbine Muguruza.
Muguruza was leading 6-3, 1-0 when Williams called it a day in the battle of former world number ones.
“Before the match, I did not feel great, and then it just got worse with every second; extreme dizziness and extreme fatigue,” Williams said in comments released via tournament organizers.
The 10th-seeded American, continuing to work her way back up the rankings in the wake of time off to have a baby, had made a strong start, winning the first three games.
But she called for the trainer after dropping six straight.
After a long talk with medical personnel Williams took the court for the second set, but after Muguruza held serve at love Williams called a halt.
“By the score, it might have looked like I started well, but I was not feeling at all well physically,” Williams said. “I will focus on getting better and start preparing for Miami.”
It was the sixth meeting between Muguruza and Williams, all five prior coming in Grand Slams.
The last two of those were in finals, with Williams beating the Spaniard for the Wimbledon title in 2015 and Muguruza taking the 2016 French Open crown.
It was a tough draw for Williams, who defeated former world number one Victoria Azarenka in her second-round opener.
Muguruza was sorry to see it end the way it did.
“We’ve played many times and it’s always super-tough, super-exciting,” Muguruza said.
“I wish I’m going to see her soon and feeling better,” added the Spaniard, who advanced to a fourth-round clash with seventh-seeded Kiki Bertens of the Netherlands, a 7-6 (12/10), 6-4 winner over Britain’s Johanna Konta.