Rafael Nadal and Roger Federer were not in favour of the sacking.
Rafael Nadal and Roger Federer were not in favour of the sacking.

Nadal withdraws from Federer showdown

Rafael Nadal has been forced to withdraw from a showdown with Roger Federer at the BNP Paribas Open due to another knee injury.

The Spaniard had been set to play longtime rival Federer in a semi-final blockbuster on Sunday morning (AEDT).

A sombre Nadal announced his withdrawal a couple hours before he was scheduled to take the court at Indian Wells Tennis Garden.

"I warm up today in the morning, and I felt that my knee was not enough good to compete at the level that I need to compete," he said.

Nadal's right knee flared up in the second set of his 7-6(2), 7-6(2) victory over Karen Khachanov in the quarterfinals. He twice called for a trainer, who applied tape just below his knee but it was obvious that Nadal's movement was hampered.

Nadal said he won't play again until the Monte Carlo Masters on clay in mid-April.

"I don't have doubts today that I will be ready for Monte Carlo," he said.

Knee problems have dogged the 32-year-old for years, and they cut short his 2018 season after the US Open in September. He was forced to quit two sets into his semi-final against Juan Martin del Potro.

Nadal choked up discussing his withdrawal last fall, and he appeared near tears as he announced his withdrawal for the clash against Federer.

He admitted that he sometimes is sad because he feels at a disadvantage against his opponents due to his continued knee issues that force him to limit his practice and playing time.

Then he gathered himself, saying, "It's not the moment to complain much. With all this stuff, I still where I am today."

The year began promisingly enough. Nadal didn't drop a set in reaching his fifth Australian Open final, where he lost to Novak Djokovic. He's ranked No. 2 in the world and has a match record of 11-2.

"Still tough because I felt more or less OK during this beginning of the season in terms of my knee," he said. "Now it starts the process that I have to decide what direction we have to take to recover well and to recover as soon as possible."

Even with all of his injuries, Nadal indicated he has no intention of giving up playing on hard courts, the surface for two of the four Grand Slam events.

"My goal is to play on all the surfaces," he said.

It would have been the 39th career meeting between Nadal and Federer, who advances to the final in pursuit of a record sixth title at Indian Wells.

Federer will play either Milos Raonic or Dominic Thiem.