"To me, it seems terrible," world number two Nadal said at an awards ceremony in Madrid on Thursday. "Why is he saying this now that he has retired?
"It's a way of damaging the sport that makes no sense. I believe our sport is clean and I am the first one that wants that. Cheaters must be punished and if Agassi was a cheater during his career, he should have been punished."
World number one Roger Federer, who beat Agassi in the final of the 2005 US Open, also spoke of his sadness at the eight-time major winner's admission in his new autobiography ‘Open’. "It was a shock when I heard the news." Federer said at a sponsors meeting at Kilchberg near Zurich. "I am disappointed and I hope there are no more such cases in future.... our sport must stay clean."
However, Agassi found support at home, with fellow American and Wimbledon finalist Andy Roddick saying the 39-year-old remained his hero despite the revelations.
Roddick was one of many compatriots who remained unfazed by Agassi's admissions.
"Andre is and always will be my idol. I will judge him on how he has treated me and how he has changed the world for (the) better," Roddick said.