Five-time finalist Andy Murray will miss the Australian Open after a solution to find a "workable quarantine" following his positive test for coronavirus could not be found.
The former world number one had hoped to travel safely and compete as planned on the back of a negative test.
Murray said he was "gutted" not to go.
He was asymptomatic and is now out of self-isolation, but finding a way for him to travel to Australia and then going into quarantine before the tournament starts on 8 February proved too difficult.
"We've been in constant dialogue with Tennis Australia to try and find a solution which would allow some form of workable quarantine, but we couldn't make it work," said Murray.