World Athletics, the sport's governing body, limited the number of Russians eligible to compete internationally this year to 10 in response to doping offences by senior staff at Russia's suspended athletics federation.
Sun Yang was banned for eight years last Friday for missing an out-of-competition test in 2018, and Chad Le Clos, who lost to his rival in the 200-metres freestyle final in Rio de Janeiro four years ago, believes justice has been done.
Champions were dethroned, new national heroes born and world records smashed
Triple Olympic gold medal winner Kenenisa Bekele said he was bitterly disappointed to be left out of Ethiopia's team for the Rio Olympics and blamed members of the country's athletics federation he said knew nothing of the sport.
Former World No 1 Greg Norman has said he feels sorry for Tiger Woods' position as a fallen idol.
Take a look at the profile of Maria Sharapova who told a news conference on Monday she failed a drugs test.
In a statement, Nike said it did not comment on ongoing litigation.
The BBC report said a third of medals in endurance events at the Olympics and world championships between 2001 and 2012 were won by athletes who have recorded "suspicious tests".
Former Wimbledon and French Open champion Simona Halep had her four-year doping ban cut to nine months.
Refusing to budge from its stance, the Wrestling Federation of India floated a new theory on Tuesday, alleging that some junior officials of the Sports Authority of India and National Anti Doping Agency are responsible for Narsingh Yadav being handed a four-year ban for doping.
News of all that's transpired on and off the football field
A summary of sports events and sports persons, who made news on Wednesday
Russian whistleblower Yulia Stepanova may be in danger after her revelations on doping in her country that triggered a massive scandal and forced her to flee, but it is not the International Olympic Committee's responsibility, the IOC said on Saturday.
At the medal ceremony, Scott shook hands with fellow bronze medallist Martin Malyutin of Russia, who finished with the same time as the Briton, but then completely cold shouldered Sun, refusing to make eye contact and not offering a handshake.
The world governing body for athletics (IAAF) fought back on Tuesday against media reports of suspected widespread doping in the sport, rejecting accusations it failed to investigate dubious drugs test results properly.
News of all that's transpired on and off the football field
Russia has been banned from the 2018 Pyeongchang Winter Olympics after the IOC found evidence of an "unprecedented systematic manipulation" of the anti-doping system that has led to a series of bans for the country's athletes in recent months.
Bulgarian triple jumper Gabriela Petrova had her doping suspension lifted by the IAAF on Monday, less than a week after the World Anti-Doping Agency (WADA) announced an amnesty for athletes who had tested positive for meldonium before March 1.
One of Maria Sharapova's biggest sponsors, Nike Inc., said it was suspending ties while the case is being investigated.
Athletes from one sport should not be punished for the sins of those from another, the IOC president said on Wednesday, cooling speculation that Russia could be banned from the Olympics altogether for systematic doping.
A summary of sports events and sports persons, who made news on Friday
Kenya's top runners have urged athletics fans and sports enthusiasts across the world to keep faith in them, despite media allegations of widespread doping in the east African nation famed for its top-class runners.
South Korean police have arrested a foreign athlete competing at the World Aquatics Championships in Gwangju for suspected sexual harassment at a nightclub, a South Korean police official said on Sunday.
World athletics president Sebastian Coe said he reacted with "shock, anger and sadness" to this week's allegations of bribery, extortion and doping cover-ups and said the sport faces a "long road to redemption".
'Mr. Bhamara would like to state that he was and remains a clean competitor and has always played basketball fairly'
Tennis World No 5 Rafael Nadal and Olympic champion Mo Farah have spoken in defence after Russian cyber espionage group Fancy Bears leaked their medical data on Monday.
Swimming's world body FINA promised on Wednesday to investigate "as a matter of utmost urgency" new allegations of Russian doping if they could be substantiated by evidence.
Summary of sports events and persons who made news on Wednesday
Long jumper Murali Sreeshankar on Sunday 'voluntarily' gave dope sample to the NADA officials after producing a big leap of 8.41m to qualify for the upcoming World Championships so that 'nobody points any finger of suspicion'.
A distraught Alysia Montano called her career 'a farce' and branded the International Association of Athletics Federations (IAAF) "a corrupt institution" after crashing out of the US Olympic trials on Monday.
The hearings at the Lausanne-based Court of Arbitration for Sport (CAS) are expected to run until Friday. The court said it was unclear when a ruling might be rendered.
World athletics' governing body decided on Friday to maintain its doping ban on all Russian athletes, Sky News reported, quoting unnamed sources, leaving the country's hopes of competing in the Rio Olympics dependent on Olympic chiefs giving special dispensation at a meeting next week. The Council of the International Association of Athletics Federations (IAAF) was meeting in Vienna to decide whether to lift the ban after hearing from a task force that significant doping problems still existed in Russia. The suspension was first imposed in November and extended in March. A spokeswoman for Russia's athletics federation said she could not confirm the reports that the ban had been upheld.
She should win her place thanks to good results, says Radwanska
World No 2 Andy Murray says Maria Sharapova should be banned after her positive test for meldonium and questioned the Russian's use of the drug for medical purposes.
Nike Inc shut down its Nike Oregon Project training group on Thursday, following the recent four-year ban of founder and coach Alberto Salazar by the US Anti-Doping Agency.
With the Rio Olympics less than three weeks away, the IOC on Monday promised "the toughest sanctions available" after a report found Moscow had concealed hundreds of positive doping tests in many sports ahead of the Sochi winter Games.
Kenyan Brigid Kosgei broke Paula Radcliffe's 16-year-old women's marathon world record but former Alberto Salazar coached athletes, including Mo Farah, were never a factor in the Chicago Marathon.
Summary of sports events and persons who made news on Friday
'There are so many guys who are hungry, want to win, are competitive, really talented and great athletes. It doesn't necessarily have to be one guy.'
The athletes were unable to enter Australia due to government restrictions on foreign nationals travelling from China.
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