Roger Federer joins Andy Murray in calling for more drug tests in tennis

Roger Federer at the US Open (GETTY IMAGES)

Roger Federer is backing Andy Murray's call for more drug-testing in tennis. "I feel I'm being tested less now than six or seven years ago," Federer said.

"I agree with Andy, we do not do a lot of blood-testing during the year. I'm fine about having more of that. I think it's important to have enough tests out there.

"I don't like it when I am not being tested enough during the year. I think they should up it. It is vital the sport stays clean. We have had a good history and we want to ensure it stays that way."