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Federer: Tennis is doing well in doping fight
As Maria Sharapova ends her 15-month ban, Roger Federer tells CNN Sport's Amanda Davies that in comparison to other sports, tennis is "doing a lot" to combat the scourge of doping.
02:25 - Source: CNN
Athletes and doping 16 videos
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Federer: Tennis is doing well in doping fight
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LONDON - JUNE 27: Maria Sharapova of Russia serves against Nathalie Dechy of France during the seventh day of the Wimbledon Lawn Tennis Championship on June 27, 2005 at the All England Lawn Tennis and Croquet Club in London. (Photo by Mike Hewitt/Getty Images)
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Canadian sprinter Ben Johnson sets a world record in the 100 metres final at the 1988 Summer Olympics in Seoul, 24th September 1988. (Photo by Tony Duffy/Getty Images)
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