Usain Bolt says no guarantees Rio sprints will be clean
Last Updated: 09/08/16 9:44am
Usain Bolt admits there are no guarantees he will be defending his Olympic sprint titles against a completely clean field in Rio.
Track-and-field's biggest star is aiming to complete a 'triple triple' of gold medals and goes into the Games as holder of the 100m, 200m and 4x100m relay titles.
The build-up to Rio has been dominated by the Russian doping scandal, while Bolt's rivals Justin Gatlin and LaShawn Merritt have both served drug bans.
Appearing at a press conference in Brazil Bolt was asked whether he could be certain of drug-free sprint contest, and he said: "In life nothing is guaranteed.
"For me going out there I never worry about that. I just go out there and compete.
"I think we're going in the right direction, I must say. I think we're weeding out the bad ones. We have to go through a rough time before we get to the good times."
Bolt, 29, again confirmed he is competing at his final Olympics.
