Hard-serving Canadian Milos Raonic withdrew from the China Open on Saturday ahead of his semi-final match against Bulgaria's Grigor Dimtrov.

The third-seeded Raonic rolled his right ankle in Friday's quarterfinal victory over Pablo Carreno Busta and suffered a partial ligament tear.

"Yesterday during my second match in the evening, I rolled over my ankle, obviously caused it some level of a sprain," Raonic said.  "I did a test this morning, which showed I had a partial tear on the outside of my ankle. I was told to give it a try. I tried to warm up just before the match like I would normally, and I was unable to play. Therefore, it seemed to be the correct decision to have to withdraw from this match I was looking forward to this evening."

Raonic took to the court Saturday morning to apologize to the fans for not being able to play.

The next event on the ATP Tour is the Masters 1000 in Shanghai, where Raonic has a first-round bye.