Australian Nick Kyrgios has sensationally withdrawn from the Australian Open with a knee injury.

The 19th seed was due to play Russian Roman Safiullin in the first round on tomorrow night.

The injury is believed to be a meniscus tear and a cyst- with Kyrgios warned it would get worse if he were to compete.

“It’s just bad timing,” Kyrgios said.

“That’s life, you know. injuries are part of sport … I’m not doubting that I’ll be back to my full strength.

“Devastated obviously. It’s my home tournament … and going into this event as one of the favourites, it’s brutal.”