Roger Federer wants doping crackdown in wake of Maria Sharapova failing test | Roger Federer | The Guardian
The Tennis Purist: The Curious Case of Roger Federer
Federer: "Tennis schaffst du locker ohne Doping" · tennisnet.com
Rafael Nadal doping claims falsely spread by French star due to Roger Federer 'rivalry'? | Tennis News
Tennis on the right track in anti-doping fight - Federer
Doping tests 2019: Federer, Nadal and Struff right at the forefront · tennisnet.com
Roger Federer: World No 1 had more than 14 anti-doping tests in 2017 | Tennis | Sport | Express.co.uk
Federer, Nadal disagree with Djokovic on Troicki's doping case - Sports Illustrated
Roger Federer - Wikipedia
Roger Federer saddened by Lance Armstrong's doping scandal | Cycling News
Tennis Should Boost Doping Fight, Says Federer – Evolutionary.org
Federer wants more doping tests in tennis - SWI swissinfo.ch
Back From a Knee Injury, Federer Tries to Catch Up - The New York Times
Roger Federer calls for tougher doping measures but rival Novak Djokovic says demands are 'a little bit too much' | Daily Mail Online
Novak Djokovic slams tennis' anti-doping procedures | South China Morning Post
Federer wants more doping tests in tennis | Tennis News – India TV
Federer calls for more frequent doping tests
Quarter-finalists should get drug tested at every event, says Federer
Shocked Federer breaks silence on Sharapova doping scandal
Roger Federer, Rafael Nadal weigh in on Viktor Troicki's doping ban - Sports Illustrated
Roger Federer demands more regular drug testing in tennis and greater investment in anti-doping
Federer: 'Naive to think tennis is clean' | CNN
Sharapova fiasco: Roger Federer roots for consistent global dope testing
