Andy Murray has been slammed by Boris Becker over his claims he thought some opponents may have used drugs to boost their performance.
Becker, who was a six-time Grand Slam winner during his playing career and is currently world number one Novak Djokovic's coach, spoke out following Murray's comments on the use of performance-enhancing drugs after the Scot supported the ban on Maria Sharapova following her failed test for meldonium at the Australian Open.
The British number one also added that when he has faced opponents who failed to tire in long, arduous contests, he suspected that they could be using drugs to aide them.
Becker felt Murray's comments were very disappointing and insisted that all the players should be viewed as innocent until proven guilty, including the world number two, without having a shadow of doubt placed on them.
The German told the Daily Mail: "We have random drug-testing and unless it's proven, they are 100 per cent innocent.
"So to assume something because somebody has won a grand slam or is fitter is totally out of order. Andy is one of the fittest players on the tour - he often outlasts players and nobody is questioning his ethics.
"I believe 100 per cent Andy is clean. Roger [Federer] is clean, Rafa is clean, all these guys are clean. Novak gets tested a lot. That can mean twice in a grand slam."