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Rafael Nadal has denied taking performance-enhancing substances in the wake of Maria Sharapova's failed drugs test.
Nadal has never failed a drugs test but there have been rumours that the 14-time Grand Slam winner used banned substances to speed up his recovery from injury.
Sharapova's announcement that she tested positive at the Australian Open has brought highlighted the issue of drug use within the sport, but Nadal has made it clear he has never taken drugs to aid his performance.
"I am a completely clean guy. I have never had the temptation of doing something wrong," Nadal told reporters.
"I believe in the sport and the values of the sport.
"It is an example for the kids and if I am doing something that goes against that, I will be lying to myself, not lying to my opponents."
While he has denied taking performance-enhancing drugs, Nadal admits to using Platelet Rich Plasma (PRP) therapy.
“I have been open all my career. I never tried to hide nothing that I did. I did PRP and then I did stem cells. The first time with PRP it worked fantastic and the second time it was bad. I had to stop playing tennis for seven months," he stated.
“With stem cells, I used it two times on my knees and it worked very well. I am not doing, never did, and never going to do something wrong.”
Sharapova faces a four-year ban for testing positive for meldonium, which was only added to the World Anti-Doping Agency's banned list this year.
Although she was taking the drug legally for ten years, Nadal believes she should be punished.
"It is difficult to imagine that something like this can happen, but mistakes happen. She should be punished," he said.
"I want to believe it is a mistake for Maria. She didn't want to do it. But obviously it is negligence. She must pay for it."