Oft-injured Raonic, Kyrgios, Kokkinakis back on the sidelines

Milos Raonic has picked up another injury, withdrawing from Monte Carlo because of a knee problem.

Raonic called the trainer for his knee during his second-round match and withdrew before facing Marin Cilic in the third round, saying he could not "play with that amount of pain."

Raonic withdraws from Monte Carlo:

"I rotated on my knee," he said. "I thought through treatment, and so forth, it would be better."

The knee is the same one that he had injury problems with during the offseason in 2017.

Nick Kyrgios, who had been having knee and hip problems, had returned to competition at Houston a week ago but appeared to experience elbow issues. On social media, he said he had an impinged nerve, and that he had a "corticosteroid injection to settle the pain and inflammation."

Kyrgios indicated that he still plans to compete during the clay-court season, but wanted to train and build "confidence in my elbow'' before returning.

Thanasi Kokkinakis, meanwhile, tripped on an advertising block on court during his first-round match, falling in two sets to Karen Khachanov.

The Australian was seen on the grounds in crutches, and umpire Mohamed Layhani was picked up on courtside microphones this week saying he broke his kneecap in the fall.

"Gotta move those," Kokkinakis tweeted alongside a clip of the incident.

All three players have been experiencing frequent injury problems in recent years.

They have not yet announced a withdrawal from any tournaments on their schedule.

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