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Novak Djokovic labels Lance Armstrong 'a disgrace'

World No.1 Novak Djokovic is confident tennis is safeguarded from the doping that has rocked cycling by the testing measures the sport has in place.

Djokovic slammed disgraced cyclist Lance Armstrong, who confessed to doping throughout much of his professional career in a television interview with Oprah Winfrey.

He said he cheated in each of his seven Tour de France victories.

"I think it's a disgrace for the sport to have an athlete like this," Djokovic said after his third round win over Czech veteran Radek Stepanek.

"He cheated the sport.

"He cheated many people around the world with his career, with his life story.

"I think he should suffer for his lies all his years."

Djokovic said he used to enjoy watching cycling but felt that many of the great champions were tainted by the doping.

Former Belgian tennis pro Christophe Rochus made claims in 2010 that drug-taking in tennis was rife and he recently told Belgian radio that performance-enhancing drugs were still used.

The former world No.38 accused the sport's authorities of covering up chemical cheating.

Djokovic said results had shown the sport was clean and he believed drug-testing in tennis were rigorous enough.

He welcomed more blood testing if that helped prove the sport was clean.

"From my perspective, it's really good," the Serb said.

"We have to write where we are every day of our lives so they have an opportunity to test us every day of 365 days in a year.

"I think that doesn't give anybody a chance to do something that is unsportsmanlike.

"The results are showing that.

"In last few years there maybe has been one or two cases, but those players were more or less outside of the hundred (at the top of the rankings)."