Defending champion Iga Swiatek out of Miami Open with rib injury

Defending champion Iga Swiatek pulled out of the Miami Open on Wednesday because of a rib injury.

The No. 1-ranked Swiatek was supposed to face Claire Liu in the second round on Thursday.

As a seeded player, three-time Grand Slam champion Swiatek received a first-round bye in the hard-court tournament that she won a year ago during a 37-match unbeaten run that was the longest in women's tennis in a quarter of a century.

Swiatek, a 21-year-old from Poland, said after a 6-2, 6-2 loss to eventual champion Elena Rybakina in the BNP Paribas Open semifinals Friday that her rib was bothering her.

Instead of playing Swiatek, Liu will go up against 94th-ranked Julia Grabher, who lost in qualifying but now gets to move into the draw.

Liu advanced Tuesday when her first-round opponent, Katerina Siniakova, stopped playing in the second set because of a hurt wrist.