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."