Andy Murray has thrown his unequivocal support behind the crackdown on time-wasting in tennis because he believes it will turn the sport into even more of a survival of the fittest.

The US Open champion was speaking after he eased into the Brisbane International final on Saturday when his opponent Kei Nishikori retired but he does have one issue with the ruling, admitting the 25-second limit is a little too short.

The top-seeded Briton and Bulgaria's Grigor Dimitrov will contest the Brisbane title on Sunday amid widespread controversy over the strict enforcement of a rule that had been virtually ignored for years.

Dimitrov will aim to usurp the defending champion after a 6-3 5-7 7-6 triumph against Marcos Baghdatis that was notable for the Cypriot being penalised for a time violation in the deciding tiebreaker.

The Association of Tennis Professionals (ATP) is trying to speed up matches and an automatic fault was called against Baghdatis when he exceeded the time limit at 2-2 in the tiebreaker.

Baghdatis was clearly agitated by the call at such a crucial juncture and Dimitrov won the decider 7-5 to reach his first tour final and earn a clash with Murray.

The Briton made a sluggish start to his semi-final but rallied to lead Nishikori 6-4 2-0 when the Japanese number one withdrew because of a knee injury.

Murray said the crackdown on time wasting had stemmed from Novak Djokovic's win over Rafael Nadal in their gruelling 2012 Australian Open final that lasted almost six hours.

"I'm for them being more strict with the time, but I think they maybe should have increased the time allowed first, because 25 seconds goes by pretty quick," Murray said.

"We were told the reason for them changing the rule is because of the Open final last year, which I think everyone agrees was a classic match.

"Right now, that match is getting shown whenever there is a delay or someone has pulled out or something, so it's not like the TV hated the match and they're never going to show it again," he added.