Willis won the 1500m silver medal in the 2008 Summer Olympics. He originally placed third but the eventual disqualification of Rashid Ramzi due to a positive drug test saw Willis's bronze medal become a silver one, which he received in 2011. On 2 May 2018, it was announced that, Asbel Kiprop of Kenya, who was declared the champion on Rmazi's disqualification, had tested positive for the banned performance-enhancing drug EPO Although this raises the possibility of Kiprop being disqualified and Willis being declared champion it is highly unusual for any drug sanction to cover more than a few years.