Donavan Brazier shrugged off the doping controversy surrounding his Nike Oregon Project training base on Tuesday to blast to 800 metres gold at the World Championships.
The 22-year-old American produced a tactical masterclass at Doha's 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 is one of several World Championships athletes based at the Nike-backed Oregon Project, whose leader Alberto Salazar was hit with a four-year ban for doping violations after a four-year investigation by the United States Anti-Doping Agency (USADA).
Brazier revealed after his win he had been unaware of the investigation against the controversial running guru when he joined the training group last year.
"I didn't know anything about it," Brazier said. "I just woke up to a text this morning and found out."
Brazier emphasised that he had little contact with Salazar at the Oregon Project, where he is coached by Pete Julian."