Czech sixth seed and two-time Wimbledon champion Petra Kvitova withdrew from Roland Garros on Monday with a left arm injury.
Kvitova had been due to play Romania's Sorana Cirstea in her opening Roland Garros match on Court Suzanne Lenglen later in the day.
"I am so disappointed to have to announce my withdrawal from Roland Garros," Kvitova, 29, wrote on Twitter.
"I have had pain in my left forearm for a few weeks and last night an MRI confirmed a Grade Two tear which unfortunately could get worse if I play today."
Kvitova has been replaced in the draw by Slovenian lucky loser Kaja Juvan.