Rafael Nadal withdrew from the Indian Wells tournament on Saturday with a knee injury, shortly before his eagerly-awaited semi-final clash with great rival Roger Federer.
It would have been the first meeting between the pair since 2017.
The Spaniard's right knee flared up in the second set of his 7-6 (2), 7-6 (2) victory over Karen Khachanov in Friday's quarterfinals. He twice called for a trainer, who applied tape just below Nadal's knee.
"I warmed up today and I felt that my knee was not good to compete at the level I needed to compete in semi-final," Spain's Nadal said in a statement. "It's tough for me to accept all these things that I'm going through in my career."
Nadal confirmed he will not play again until the Monte-Carlo Masters clay event in mid-April.
Federer, 37, will play either Milos Raonic or Dominic Thiem in the final, bidding for his 101st career title.
Reporting by Reuters.
