WASHINGTON (AFP) - Former world number one Andy Murray withdrew from next week's ATP Masters Toronto event on Friday (Aug 3), with his wildcard passed along to another three-time Grand Slam champion, Swiss Stan Wawrinka.

Both stars are making comebacks from injuries. Britain's Murray missed 11 months with a right hip injury before reurning in June.

Wawrinka was out eight months with a left knee injury.

Murray's move came hours after an emotional three-set victory at the ATP Washington Open that ended at 3.02am on Friday and left him crying into a towel for minutes after the match.

The three-hour marathon was Murray's third gruelling three-set win of the week. He has been on court for eight hours and 11 minutes entering a scheduled quarter-final on Friday against Australian teen Alex De Minaur.

But Murray said he might not play the match after finishing so late - the latest finish in the 50-year history of the event, the grind and rain delays over the first four days taking a toll.