Six weeks before the Summer Olympics start in Rio de Janeiro, the laboratory that was set to handle drug testing at the games has been suspended by the World Anti-Doping Agency in a new escalation of world sport's doping crisis.

A week after being belatedly crowned Olympic champion Jared Tallent could be in line for further retrospective medals after reports Italian Alex Schwazer, who has twice beaten him to gold, has failed another drug test.

The coach of Ethiopian world 1500-metre champion Genzebe Dibaba has been arrested after Spanish police raided his hotel room and found traces of EPO and other banned substances.

Track star Genevieve LaCaze will represent Australia in two events at the Rio Olympics after posting a 5000m qualifier to add to her 3000m steeplechase berth.

Australian athletes to benefit from banned Russian drug cheat.

The Kremlin has vowed to pull out all legal stops to defend Russian athletes if they are banned from taking part in the Rio Olympics over doping allegations.

Raelene Boyle was twice cheated out of Olympic gold just as Jared Tallent was. She knows she is just as deserving of retrospective gold medals as Jared Tallent. But she also knows she is unlikely ever to get those medals like Jared Tallent did in Melbourne on Friday.

One thousand four hundred and five days after he should have stood on the podium in London Jared Tallent's long walk to Olympic gold ended when he was awarded the gold medal denied him by a Russian doping cheat.

Russia's anti-doping agency and athletics body were "rotten to the core", says International Olympic Committee vice-president John Coates.

Friday is the day Australian walker Jared Tallent long thought would never arrive.

Emily Brichacek's body had reached breaking point.

Olympic champion hurdler Sally Pearson will reportedly skip her next race in Stockholm to return to Australia to work on her fitness.

Usain Bolt says 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.

Sally Pearson's frustrating return from a serious wrist injury has continued, clocking her second 13-second-plus performance in a week in the 100m hurdles at the Diamond League event in Norway.

Sally Pearson admits she had "retired in my head" after she shattered her wrist in Rome twelve months ago.

Sally Pearson called it a disgusting result, in fact she couldn't remember the last time she ran slower than 13 seconds but all things in context the Olympic hurdles champion was also excited at her first race in a year.

An Olympic medal beckons for impressive Australian long-jumper Fabrice Lapierre, with the veteran declaring he's in the form of his career after notching a fourth Diamond League podium finish.

Usain Bolt could be stripped of one of his six Olympic titles after allegations that one of his Jamaican 4x100metres team-mates with whom he won gold at the 2008 Games has tested positive for a banned substance.

American Kendra Harrison beats Australian hurdles champion Sally Pearson's quickest hurdles sprint.