Doha - Donavan Brazier of the United States shrugged off the doping controversy surrounding his Nike Oregon Project training group on Tuesday to blast to 800 metres gold at the World Championships in Doha.
The 22-year-old American produced a tactical masterclass at the Khalifa Stadium to surge away from the field in a championship record time of 1min 42.34sec, breaking the previous mark which had stood for 32 years.
Brazier ran a flawless race, settling into his rhythm on the first lap and then kicking for home down the back straight on the final lap.
The burst of power was too much for his rivals, with Amel Tuka of Bosnia taking silver in 1:43.47 and Kenya's Ferguson Rotich bronze in 1:43.82.
Brazier is one of several athletes at the World Championships who trains with the Nike-backed Oregon Project in Portland.
The leading coach of the training group, Alberto Salazar, was handed a four-year ban by the United States Anti-Doping Agency on Monday for doping violations.
Salazar was on Tuesday banned from attending the World Championships in Doha while athletes linked to the coach were told by authorities to sever all contacts with the coach.