Factbox on American Justin Gatlin who won the 100 metres gold at the World Athletics Championships on Saturday at the age of 35.
Cracking the whip on dope offenders, Indian Weightlifting Federation (IWF) on Saturday handed life bans on three lifters, including 2006 Commonwealth Games silver medallist Vicky Bhatta (56 kg), for their second dope offences.
A female gymnast from Uzbekistan was provisionally suspended from the London Olympics on Sunday after failing a drug test, the second doping case of the games.
National Anti-Doping Agency chief Navin Agarwal confirmed the former India captain was tested by NADA officials in March but declined to elaborate further.
The Olympic Council of Asia has urged Uzbekistan to investigate doping in their delegation after a second athlete was disqualified from the Asian Games on Wednesday for the same banned stimulant.
Here are some reactions from the world of sport on of widespread state-sponsored doping by Russian athletes at the 2014 Sochi Olympics.
'People are saying I need to win for the sport but there's a lot of other athletes out there running clean, and who have run clean throughout their whole careers'
Indian wrestler Narsingh Yadav has been banned for four years by the Court of Arbitration for Sports (CAS) following an appeal by the World Anti-Doping Agency (WADA).
Five Brazilian athletes training in Germany for this month's world championships have failed out of competition doping tests and will return home, the Brazilian Athletics Confederation (CBAt) has said.
An Italian court indicted former Giro d'Italia winner Damiano Cunego and 26 others on doping charges involving his Lampre-Merida team on Friday, in a new blow for a sport dogged by drug scandals.
The final version of a report which has already revealed a system of state-sponsored doping in Russia is still several months away, its author Richard McLaren said on Friday.
US sprinter Justin Gatlin overcame a bout of jitters to win his comeback race following a four-year doping ban in 10.24 seconds on Tuesday.
US sprinter Justin Gatlin will return from a four-year doping ban with two races in Estonia next month, he said on Monday.
She tested positive for the prohibited stimulant pemoline during competition at the championships in Helsinki which ended on Sunday.
President Vladimir Putin said on Thursday he supported Russians competing at the 2024 Paris Summer Olympics but that the country should ponder whether it should compete.
India sprinter Dutee Chand has tested positive for prohibited anabolic steroids during an out-of-competition testing and has been provisionally suspended.
The same scandal has led to 109 out of 387 athletes originally included in the Russian team for the Rio Olympics being banned, including its entire track and field squad.
Five-times Olympic speed skating champion Claudia Pechstein's dreams of a sixth Winter Games were snuffed out for good on Thursday when the German's appeal to be allowed to skate in Vancouver was thrown out.
A ban imposed on Russia's Paralympic team to compete in Rio is cynical and immoral, President Vladimir Putin said on Thursday, while saying that Moscow acknowledged its mistakes and would improve the national anti-doping system.
Claiming to have accessed WADA's database, Fancy Bears' hack team claimed to have leaked dozens of files allegedly relating to United States athletes on the internet.
WADA identified Doctor Sergei Portugalov, former deputy director of the Russian Federal Research Centre of Physical Culture and Sports (VNIIFK), as the mastermind of the scheme, advising athletes on doping, administering injections and helping cover up positive drugs tests.
Sharapova, 29, had called the ITF's original ruling "unfairly harsh" because she had not intentionally violated anti-doping rules.
The provisional suspension on the 11 dope tainted athletes, including one in the Commonwealth Games squad, was lifted by the NADA disciplinary committee following WADA's decision to shift the banned stimulant from 'non-specified' to 'specified' substance category.
Images from the athletics action at Stade de France, Saint-Denis, Paris, on Friday.
The World Anti-Doping Agency WADA has issued a revised draft code inserting a proposed Olympic ban for serious doping offenders from January 2015.
India's six top women athletes, including Asian Games double gold-medallist Ashwini Akkunji, were, on Friday, handed one-year bans for flunking dope tests earlier this year, virtually ending their chances of participating in the London Olympics next year.
Brazil midfielder Fred, no relation to the veteran striker of the same name who used to play for the same country, has been suspended from South American football for a year for failing a drugs test.
Pakistan pacer Shoaib Akhtar has lot of reasons to look forward to the upcoming World Cup, having missed the previous edition due to a doping ban, and one of them is the possibility of a duel with Indian batting icon Sachin Tendulkar.
Dwain Chambers achieved the first stage in his bid to run at the Beijing Olympics when he won the 100 metres final at the British trials on Saturday and must now await a legal ruling on his eligibility.
Azeri weightlifter Valentin Hristov was stripped of his 2012 Olympics 56-kg bronze medal on Friday after he was one of three athletes to test positive for banned substances in re-tests conducted by the International Olympic Committee.
Trinidad and Tobago athletics officials confirmed on Monday that Kelly-Ann Baptiste, who won a world 100 metres bronze medal in 2011, and fellow sprinter Semoy Hackett missed the Moscow world championships because of doping violations.
The International Olympic Committee (IOC) will not impose a blanket ban on Russia for next month's Rio Olympics over the nation's doping record but will leave decisions on individual athletes' participation with their sports federations, it said on Sunday.
Australian Sports Anti-Doping Authority (ASADA) chief David Sharpe said a preventative task force funded to the tune of millions of dollars by the Australian government had conducted tests on 2,600 local athletes and 500 from overseas.
A summary of sports events and persons who made news on Thursday
The National Anti-Doping Agency (NADA) Director General Navin Agarwal confirmed that they found two samples taken fromNarsingh Yadav positive for dope.
The Jamaica Anti-Doping Commission (JADCO) has hit back at allegations of poor administration and a lack of controls by a former official, insisting the authority's practices meet global standards.
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