Twenty three-time Grand Slam champion Serena Williams plans to compete at the French Open despite withdrawing from the Italian Open with a knee injury.
The American, 37, was set to play sister Venus Williams in the second round but said she would be “concentrating on rehab” now.
“I look forward to seeing you all at the French Open and next year in Rome,” she added.
Former world number one Caroline Wozniacki also pulled out in Italy.
Wozniacki, 28, withdrew from her first-round match against American Danielle Collins because of a leg injury, having lost the first set 7-6 (7-5).
It is the second straight tournament at which the Dane has been forced to retire early on.
She trailed 3-0 against Alize Cornet in the opening round of the Madrid Open earlier this month before pulling out with a back injury.