Djokovic, speaking to reporters as he prepared to defend his US Open title, said players who have bemoaned a lack of transparency in the Sinner case make a valid point.

Tennis world number one Jannik Sinner has been cleared of any wrongdoing after twice testing positive for a banned substance earlier in the season, the International Tennis Integrity Agency (ITIA) announced Tuesday.

Top Indian sprinter Dutee Chand has been banned from competition for four years after she failed two doping tests, local media reported Friday.

US swimming legend Michael Phelps has spoken of his frustration at the possibility rivals were using drugs at last year's Rio de Janeiro Olympics.

Maria Sharapova said Wednesday she refused to feel sorry for herself during her doping ban, occupying her time by studying at Harvard, writing a book and even learning how to box.

Doha's anti-doping laboratory has had its accreditation suspended for four months after it failed to comply with international standards, the World Anti-Doping Agency (WADA) says in a statement.

Mo Farah, Rafael Nadal and Justin Rose are among athletes targeted in the latest leak of confidential medical documents that the world anti-doping agency (WADA) says were hacked by a Russian cyber espionage group.

Brazilian cyclist Kleber Ramos and Chinese swimmer Chen Xinyi are disqualified from the Olympic Games for having failed doping tests, the Court of Arbitration for Sport (CAS) says.

Brazilian police arrest two US swimmers and a top International Olympic Committee official as scandal overshadows the Rio Games.

Chinese Olympic women's swimmer Chen Xinyi tests positive for a banned substance at the Rio Olympics.

Taiwan's former weightlifting world record holder Lin Tzu-chi is suspended from competing in the Rio Olympics 2016.

American teenager Lilly King celebrates stopping tainted Russian swimmer Yulia Efimova from getting an Olympic gold as doping hostilities worsen in Rio.

Russian Olympians turn out in force to see their flag raised over the athletes' village in Rio on Wednesday.

For as long as athletes have been battling for gold medals, they have been taking fortifying tonics, some stomach-churning, others downright dangerous with little concern for their health.

India's Narsingh Yadav is exonerated of doping charges on Monday after an Indian anti-doping disciplinary panel rules in his favour.

A three-member International Olympic Committee (IOC) panel will have the final say on which Russian athletes can compete at the Rio Games, reviewing all decisions taken by the international federations, the IOC said on Saturday.

Russia's sports minister says that the national team to compete in the Rio Olympics starting next week so far has 266 competitors.

Athletics' governing body says it has definitively rejected Moscow's request to review its blanket ban of Russia's track and field team from next month's Rio Olympics over state-sponsored doping.

The International Olympic Committee's decision to reject calls to ban all Russian competitors from the Rio Olympics could lead to "lesser protection for clean athletes," the World Anti-Doping Agency (WADA) says..

The International Olympic Committee (IOC) fails to demonstrate strong leadership on a sad day for clean sport when it declines to ban Russian athletes from the Rio Olympics, anti-doping officials say.