Usain Bolt bade one final, emotional goodbye to a sport he has dominated for the past decade with a lap of honour at the end of the World Championships in London.

Athletics chief Sebastian Coe described the sight of Usain Bolt pulling up injured in the final race of his glittering career as "horrible".

Justin Gatlin upset Usain Bolt to claim the 100 metres title at the World Championships on Saturday but was mercilessly booed during the competition.

Usain Bolt insisted he had no regrets after Justin Gatlin gatecrashed his farewell in the 100 metres final at the World Championships.

THE relentless rolling on of time changes everything and nothing. 

Furious Usain Bolt admitted he must improve his start as he plots a winning farewell at the World Championships.

Muhammad Ali stood alone on many fronts, but Joe Frazier, George Foreman and a few others still stood toe-to-toe with him in the ring. Jack Nicklaus contended with Arnold Palmer on the front end of his career and Tom Watson on the back end.

Usain Bolt has warned dopers they risk killing athletics and urged them to clean up their act for the sake of the sport.

Usain Bolt brings the curtain down on an extraordinary career in London ready to turn the World Championships into his personal party.

Usain Bolt ducked under 10 seconds for the first time this year to win his last ever race outside of a major championships.

Usain Bolt stormed to victory for a final time on home soil, winning the 100m final in front of a sell-out stadium in Jamaica.

Even here in his homeland a lot of us have little idea how respected he is.

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Usain Bolt hopes he has achieved a feat no man will be able to match as he completed his 'triple triple' mission by anchoring Jamaica to gold in the men's 4x100 metres relay on his final Olympic appearance.

The two were all smiles as they crossed the line.

Usain Bolt's belief that he could threaten his 200 metres world record at the Rio Olympics did not look misplaced as he sauntered into the semi-finals.

Great rivalries are made at the Olympic Games. We have Michael Phelps and Chad le Clos in swimming, Bolt and Gatlin in the 100m sprint, the O’Donovan brothers and those très cool French dudes in the rowing. But you ain’t seen nothin’ like Ross and Hickey in the egos.

Usain Bolt has given a “thumbs up” to the decision to ban the Russian athletics team from the Rio Olympics because of widespread doping.

Winning times are down - but how much of it is due to better track maintenance, asks Tommy Lyons.

"Every story has a beginning. This is mine."

That’s the Greatest Of All Time. Whether it be Michael Phelps or Usain Bolt monopolising another Olympic Games, Novak Djokovic seeking a Grand Slam or Katie Taylor punching her way into legend, the sporting record books look set for another complete rewrite in 2016...

Castlebride Bolt should take plenty of beating in tonight’s sixth race at Youghal.

Jacques Burger is afraid of nothing. Completely fearless, he says. Then he remembers. “No, but I am afraid of things off the pitch, I promise you that. Oooh, snakes for instance. I don’t like snakes very much,” he says with a theatrical shudder.

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The ghosts of 2007 don’t exactly haunt the corridors of Ireland’s stately home at Carton House, but valuable lessons have been learned from that shuddering World Cup experience of eight years ago.

Over the weekend Jimmy Barry-Murphy made the headlines, stepping down as Cork senior hurling manager. It was his second time in the limelight in less than a week, as he was made a member of the GAA Hall of Fame a few days ago.

One Irishwoman is the envy of athletics fans around the world after Usain Bolt gave her a very special present.

Usain Bolt stormed to the World Championship sprint double at the World Athletics Championships when a runaway segway proved more problematic than Justin Gatlin. Four days on from riding to the rescue of his beleaguered sport in the 100 metres, the Jamaican attempted to make it four successive half-lap world crowns in Beijing.

Usain Bolt again delivered when it mattered as he scorched to the fastest time of 2015 to win a record fourth straight world 200m title in 19.55 seconds and sweep the individual sprints at a global championships for a fifth time. 

Usain Bolt and Justin Gatlin will renew their battle for World Championship gold this afternoon after the pair cruised into today’s 200 metres final (1.55pm Irish time, live on BBC2).

Usain Bolt rode to the rescue of his beleaguered sport in the toughest race of his career as he dashed Justin Gatlin’s hopes of 100m gold at the World Championships in Beijing.

We all love to see great rivalry in sport, a battle between the victor and the vanquished, the goodies and the baddies.

Back at the scene of his 2008 Olympic triumphs, Usain Bolt will square off against controversial American Justin Gatlin in the 100m at the world championships.

Great athletes are a curious breed. For those who don’t know them in many circumstances, they appear single-minded, aloof and even obnoxious.

Usain Bolt blew away any fears about his fitness and fired a major warning to Justin Gatlin as he blasted to his fastest 100 metres of the year on his return to London’s Olympic Stadium last night.

The stage is set for a top class evening of athletics at the Morton Games in Morton Stadium, Santry this evening headlined by the second fastest man in history, Yohan Blake, and World Universities 400m hurdles champion Thomas Barr.

Usain Bolt is back in old London town and that is usually good reason to be cheerful, not fearful.