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.

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

Derval O’Rourke will have to wait a while longer before finally receiving her bronze medal from the 2013 European Indoor Championships, after she revealed yesterday that legal issues have added a further disruption to the process.

Both at home and further afield, it’s been a busy few day in the world of anti-doping.

Larry Ryan brings you the daft controversies, wacky conspiracy theories, memorable quotes and some of the craziest lines from the sporting year.

Drug testing has been a big part of my life as an athlete. The Irish Sports Council takes a strong stance on testing and I have been consistently drug tested for the past 12 years.

Trinidad and Tobago’s Kelly-Ann Baptiste withdrew from the World Championships due to a “doping matter”, her national athletics federation has confirmed.

Usain Bolt racked up his sixth world title in Moscow to go alongside his half dozen Olympic golds – and then declared he was far from done with winning.

Athletics’ world governing body will hand four-year bans to those caught doping from 2015 — a move president Lamine Diack hopes will help in the never-ending fight with drug cheats.

Athletics’ world governing body, the IAAF, will hand four-year bans to those caught doping from 2015.

Usain Bolt had just completed his press conference after winning 200 metres gold at the London Olympics, his second title of the Games, and had risen from his seat when he paused for a moment before deciding he had one last message to impart.

Usain Bolt is relishing the chance to perform in front of a “beautiful” Olympic Stadium crowd for the second time in two days this afternoon.

Rocket man Usain Bolt recovered from an awful start to light up the Olympic Stadium once again last night as won the 100 metres in 9.85 seconds.

Usain Bolt returns to the Olympic Stadium tonight looking to revive memories of London 2012 and at the same time lift the gloom hanging over athletics.

Irish Olympic swimmer Barry Murphy says dopers who return after a ban should be made wear different coloured bibs or hats.

Irish sprinter Jason Smyth, who trains alongside shamed American Tyson Gay, says drug cheats should be banned from athletics.

Prosecutors in Italy have launched a criminal investigation into Jamaican sprinters Asafa Powell and Sherone Simpson and their Canadian trainer Christopher Xuereb.

Irish athletes face more stringent anti-doping tests than many of their international rivals, claims the Irish Sports Council’s anti-doping programme director Dr Una May.

Athletics was today facing one of its darkest periods in recent history thanks to a devastating drug scandal.

US sprinter Tyson Gay and Jamaican former 100m world record holder Asafa Powell have failed drug tests.

Usain Bolt coasted to 100m victory at the Jamaican trials in 9.94 seconds but Asafa Powell could not book his place at the World Championships as he finished seventh.

Irish President Michael D Higgins has led tributes to Team Ireland on their outstanding performance at the London Paralympic Games.

Ireland’s Jason Smyth followed in the footsteps of Usain Bolt last night by completing a London 2012 sprint double.

President Michael D Higgins is leading the tributes to members of the Irish Paralympic team on their "outstanding" medal-winning performances at the London games.

Ireland’s Jason Smyth produced a performance training partner Tyson Gay would have been proud of by retaining his Paralympic 100 metres title in a new world record.

Four dreamlike weeks have slipped through London’s fingers since Jessica Ennis, Mo Farah and Greg Rutherford delivered three gold medals on a never-to-be-forgotten night at the Olympic Stadium that was, inevitably, dubbed Super Saturday.

Yohan Blake and Usain Bolt were again the star attractions at a cold and drizzly Diamond League meeting in Zurich.

Usain Bolt was upstaged by training partner Yohan Blake at the Athletissima Diamond League meeting in Lausanne last night.

Usain Bolt was upstaged by training partner Yohan Blake at the Athletissima Diamond League meeting in Lausanne tonight.

Judging by his Twitter activity, boxing medal hopeful Paddy Barnes is determined to make a few famous friends in London.

The queues began long before the main event.

There were mixed fortunes for Ireland’s boxers last night on a day when the track and field team also got a chance to taste the Olympic atmosphere.

Tyson Gay, the second fastest man in history, has set his sights on finding “the missing piece of my heart” in London by finally winning an Olympic medal.

Usain Bolt’s quest to become an athletics legend took a stunning blow today when the triple Olympic champion was disqualified from the 100 metres final at the World Championships for a false start.

Ireland’s Joanne Cuddihy qualified impressively for the semi-finals of the 400 metres at the World Championships in Daegu tonight, but Paralympic 100m champion Jason Smyth went out.

YOU probably didn’t know it had a name, but I’m sure you’ve come across the Cupertino Effect.

American sprinter Tyson Gay will miss the World Championships in Daegu because of a hip injury.

United States sprint star Tyson Gay is set to miss out on the chance to challenge Usain Bolt for the 100 metres title at this year’s World Championships.

USAIN BOLT has brought his 2010 season to an early close to avoid risking a serious injury which could hamper the defence of his world titles in Daegu next year.

Usain Bolt will not race again this year due to a lower back injury, his management company have announced.

Tyson Gay proved Usain Bolt is not invincible over 100metres by winning tonight's DN Galan meeting in 9.84seconds at the Olympic Stadium in Stockholm.

Usain Bolt, who pulled out of the Aviva London Grand Prix due to United Kingdom tax laws, is hoping changes will be made that enable him to race in Britain in the future.

Derry sprinter Jason Smyth made history on the Olympic Stadium track in Barcelona tonight by becoming the first Paralympian to compete at a European Athletics Championships.

JASON SMYTH makes history today by becoming the first Paralympian to compete in the European Athletics Championships.