(Miami) Iga Swiatek withdrew from the Miami Tennis Open on Wednesday due to a rib injury.
Swiatek, the defending champion and ranked number one in the world, was scheduled to face Claire Liu in the second round on Thursday.
As the top seed, three-time Grand Slam champion Swiatek enjoyed a bye to the first round of the hard-court tournament she won a year ago in a streak of 37 unbeaten matches.
It was the longest such streak in women’s tennis in a quarter of a century.
Swiatek, a 21-year-old from Poland, said after losing 6-2, 6-2 to eventual champion Elena Rybakina in the BNP Paribas Open semi-finals on Friday that her rib bothered her.
“I have to take more tests and see what happens. I don’t know yet,” Swiatek said on Friday.
Instead of playing Swiatek, Liu will face Julia Grabher, 94e in the standings, who lost in qualifying, but can now enter the main draw as a “fortunate loser”.
