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    Federer: Tennis is doing well in doping fight

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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.

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.