A Court of Arbitration for Sport decision on the two-year doping ban for Maria Sharapova has been put back two months to September, the court said Monday, ruling the tennis superstar out of the Rio Olympics.

Maria Sharapova's attorney John Haggerty hit out at World Anti-Doping Agency (WADA) head Craig Reedie for comments he made about the Russian tennis star's earnings.

World athletics' governing body decides to maintain its doping ban on all Russian athletes, Sky News reported, quoting unnamed sources.

Russia's athletes should stay banned from international competition and not be allowed to take part in the Rio Games, says a leading Olympic official.

Scandal-hit Russia will likely discover Friday that it has not done enough to get back into world track and field's governing body, the IAAF, in time for its athletes to compete at the Rio Olympics.

Usain Bolt has told Reuters he would have no problem giving back one of his six Olympic gold medals if a Jamaican relay team mate is confirmed to have failed a drugs test.

Former world number one Maria Sharapova may never play again following her failed drugs test, the president of the Russian Tennis Federation says.

Russia's sports ministry says on Wednesday it fully supports actions by the International Olympic Committee (IOC) to bar athletes who dope from competitions, but said clean athletes should not be excluded from the Rio games.

Sri Lankan wicketkeeper Kusal Perera target a swift return Thursday to international cricket after officials admitted the analysis of a doping test which triggered his suspension had been botched.