(CNN) -- Roger Federer kept his hopes alive at the ATP World Tour Finals Thursday with a straight sets win over Richard Gasquet then repeated his demand for more rigorous doping controls in tennis. "I just feel like we're not getting maybe tested enough," said Federer after completing a 6-4 6-3 win over his French opponent. "I feel like I used to get tested more, I think I was tested 25 times in 2003, 2004. Ever since, I think it's been clearly going down this season. "Also last year when I won Dubai, Rotterdam and Indian Wells, and the year before that, I didn't get tested in one of those three events that I won. For me, that's not okay.
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Roger Federer wants more drugs testing in tennis
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Reacting to the debate over Viktor Troicki's punishment
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Federer beats Richard Gasquet at ATP World Tour Finals
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Novak Djokovic into semifinals after beating Juan Martin Del Potro
By contrast, Federer said he had little sympathy for @placeholder, who saw his original ban cut from 18 months to 12 months Tuesday.