Federer: 'Naive to think tennis is clean' | CNN
The Tennis Purist: The Curious Case of Roger Federer
Quarter-finalists should get drug tested at every event, says Federer
Roger Federer - Wikipedia
Novak Djokovic slams tennis' anti-doping procedures | South China Morning Post
Federer joins fellow players in calls for stricter anti-doping in tennis
Federer: "Tennis schaffst du locker ohne Doping" · tennisnet.com
The Tennis Purist: The Curious Case of Roger Federer
Tennis on the right track in anti-doping fight - Federer
Roger Federer still surprised at lack of doping tests
Wimbledon: Serena Williams asks for fair treatment over doping tests, Federer seconds
Federer wants more doping tests in tennis | Tennis News – India TV
Roger Federer, Rafael Nadal react to Viktor Troicki´s doping ban
Roger Federer: World No 1 had more than 14 anti-doping tests in 2017 | Tennis | Sport | Express.co.uk
Rafael Nadal doping claims falsely spread by French star due to Roger Federer 'rivalry'? | Tennis News
Mental health not helped by tough tour demands, says Federer
The Tennis Purist: The Curious Case of Roger Federer
Tennis Should Boost Doping Fight, Says Federer – Evolutionary.org
Roger Federer wants doping crackdown in wake of Maria Sharapova failing test | Roger Federer | The Guardian
Federer defends doping procedures, but wants more testing | Reuters
It's about zero tolerance': Roger Federer backs Sharapova doping ban | Tennis News - Hindustan Times
Sharapova fiasco: Roger Federer roots for consistent global dope testing
Roger Federer frustrated by tennis' anti-doping programme – The Irish Times
Roger Federer was tested for doping 29 times in 2019
Federer, Nadal disagree with Djokovic on Troicki's doping case - Sports Illustrated
