Federer defends doping procedures, but wants more testing | Reuters
Roger Federer calls for tougher doping measures but rival Novak Djokovic says demands are 'a little bit too much' | Daily Mail Online
Roger Federer frustrated by tennis' anti-doping programme – The Irish Times
Roger Federer still surprised at lack of doping tests
Federer wants more doping tests in tennis
Roger Federer, Rafael Nadal react to Viktor Troicki´s doping ban
Rafael Nadal doping claims falsely spread by French star due to Roger Federer 'rivalry'? | Tennis News
Federer: "Tennis schaffst du locker ohne Doping" · tennisnet.com
Shocked Federer breaks silence on Sharapova doping scandal
Federer joins fellow players in calls for stricter anti-doping in tennis
Doping tests 2019: Federer, Nadal and Struff right at the forefront · tennisnet.com
Federer calls for more frequent doping tests
Roger Federer explains how inconsistent drug testing can be at times
Are professional tennis players doping, too? | Salon.com
Sharapova fiasco: Roger Federer roots for consistent global dope testing
Roger Federer demands more regular drug testing in tennis and greater investment in anti-doping
Tennis Should Boost Doping Fight, Says Federer – Evolutionary.org
Quarter-finalists should get drug tested at every event, says Federer
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 calls for doping crackdown post Sharapova controversy
Roger Federer calls for more doping tests in tennis | Roger Federer | The Guardian
Federer wants more doping tests in tennis - SWI swissinfo.ch
