Usain Bolt established himself as the fastest man on the planet on Saturday by setting a world record in the 100 metres. Now the 21-year-old Jamaican has his eyes on a bigger prize -- Olympic gold in athletics' blue ribband event.
The American stayed on course for a world championship sprint double by qualifying fastest for the 200 metres final.
He won the world 100 metres gold medal in the biggest winning margin in the history of the championships.
Ethiopia's Meseret Defar smashed her own 5,000 metres world record by nearly eight seconds and Jamaica's Asafa Powell cruised to a sub-10-second victory in the men's 100 at a Golden League meeting on Friday.
The Olympic and world champion said he still considers himself the fastest man in the world.
Justin Gatlin's world record in 100m has been amended to 9.77 seconds from 9.76 seconds due to an error in reading the result
The 30-year-old from Mozambique pulled away from the field on the final bend \n\nto win the 800 metres at the Golden League meeting.
Carter was found to have taken the prohibited substance methylhexaneamine, the International Olympic Committee (IOC) said on Wednesday.
The World and Olympic champion broke the 100 metres world record with a time of 9.76 seconds at an IAAF Super Tour meeting on Friday.
Usain Bolt drew down the curtain on his brilliant Olympic career by securing a sweep of the sprint titles for a third successive Games when Jamaica successfully defended the 4x100 metres relay crown on Friday.
Sportswear company Adidas has suspended its contract with Tyson Gay after the former double world sprint champion failed an out-of-competition dope test, it said on Monday.
Jamaican sprinter Usain Bolt ramped up his preparation for the Rio Olympics as he recovered from a stumble to win the men's 100 meters at the inaugural Racers Grand Prix at the National Stadium in Jamaica.
Sprinting great Usain Bolt is refusing to dwell on the disappointment of losing his Beijing Olympics 4x100 metres gold medal after his Jamaican team mate Nesta Carter tested positive for a banned stimulant.
Usain Bolt and his Jamaican team mates who won the 4 x 100m relay at the 2008 Beijing Games have been told by the country's Olympic Association to return their gold medals following Nesta Carter's failed drug test.
The Nitro Series promised to make athletics a show and the sport's ultimate show-man Usain Bolt capped its first meeting in Melbourne on Saturday by propelling his team of international "All-Stars" to a crowd-pleasing win in the 4x100 metres relay.
Five Jamaican athletes, including two Olympic medallists, tested positive for banned performance-enhancing drugs at last month's national championships, sources close to Jamaican athletics said.
Usain Bolt negotiated a series of delays and a false start in his own race before easily winning his quarter-final of the 100m in 10.15 seconds at Jamaica's national championships on Friday.
Olympic discus thrower Allison Randall on Monday became the third athlete to confirm a positive drugs test from the Jamaican trials in June following Sunday's revelations by sprinters Asafa Powell and Sherone Simpson.
Jamaican sprinter Sherone Simpson, who tested positive for a banned substance last year, told a disciplinary panel on Tuesday that she saw no "red flags" before taking a supplement supplied by her trainer.
The under-fire Jamaica Anti-Doping Commission (JADCO) has appointed a new executive director just three days before the start of a World Anti-doping Agency (WADA) audit of its operations, the Jamaican government said on Friday.
Usain Bolt secured a sweep of the three men's sprint titles for a third successive Olympics when Jamaica successfully defended their 4x100 meters relay title in 37.27 seconds on Friday.
Indian cricket team vice-captain Virat Kohli said doping in sport is simply not acceptable and called for the harshest possible punishment for those who bring disrepute to the game.
Jamaican Olympic sprint relay gold medallist Nesta Carter has returned an anti-doping violation for the banned stimulant Methylhexanamine after the re-testing of 454 samples from the 2008 Beijing Games, two sources familiar with the case have told Reuters. The Jamaican team of Carter, champion sprinter Usain Bolt and two other sprinters had won a gold medal in the relay at the 2008 Olympics. The sources, who spoke on condition of anonymity, said traces of Methylhexanamine were discovered in Carter's "A" sample, part of a batch of 454 from the 2008 Games that the International Olympic Committee (IOC) ordered to be re-tested. Carter could face sanctions only if his "B" sample also tests positive for the substance. Reuters has not seen the laboratory results. Neither Carter, who won gold in the 4x100 metres relay with Jamaican team mates Usain Bolt, Asafa Powell and Michael Frater in Beijing, nor his agent replied to repeated requests for comment.
World Anti-Doping Agency (WADA) chief John Fahey has slammed Jamaican authorities for failing to accommodate an independent audit of their anti-doping regime until next year.
American champion Tyson Gay continued his impressive buildup to next month's World championships on Thursday by winning the 100 metres at Lausanne's Athletissima Diamond League meeting in 9.79 seconds.
Double Olympic champion Mo Farah won the 5,000 metres at the Diamond League meeting in Lausanne.
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.
Jamaica's Olympic sprint champion Usain Bolt has "no problem" with plans by the World Anti-Doping Agency (WADA) to test the hair follicles of athletes in a bid to clamp down on drug cheats in sport.
Olympic sprint champion Usain Bolt said on Saturday that controversy over Jamaica's anti-doping programme is scaring off potential sponsors and costing him money.
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.
World champion Asbel Kiprop's relentless pace proved too much for his rivals, including Mo Farah, as the Kenyan clocked the fastest 1,500 metres time since 2004 at the Monaco Diamond League meeting on Friday.
Usain Bolt has enthralled hundreds of thousands in stadiums in Beijing, London and Rio as well as billions around the world.
Athletics is set to reintroduce four-year doping bans even though the move risks alienating the sport from the world anti-doping authority (WADA), officials said on Wednesday on the eve of the world championships.
The Jamaican was cagey when asked about the latest batch of positive tests and though he stopped short of condemning his rivals, he did issue a reminder of the principle that every athlete is responsible for what they put into their body.
Usain Bolt says he is not yet ready for a duel with Justin Gatlin.
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