US sprinter Tyson Gay, the fastest man over 100m this year, has failed a dope test, according to reports in the US media on Sunday.
Gay, the 2007 world champion, was allegedly informed by the United States Anti-Doping Agency (USADA) of his failed test, on Friday.
The 30-year-old’s B sample has yet to be tested. He has said he will pull out of August’s World Championships in Moscow.
Gay told US media that he had made a mistake and been let down by someone else.
News of his failed test quickly spread across social media sites on Sunday, with one report claiming he had broken down in tears when speaking of the incident.
Gay had run the fastest time in the world this year, at June’s US trials for the World Championships. He clocked 9,75 seconds, the tenth fastest 100m of all time.
With Asafa Powell not having made the Jamaican team for Moscow, the two fastest men over 100m this year will not be at the World Championships.
Gay’s personal best of 9,69 seconds in 2009 makes him the joint second fastest man ever, behind Jamaican legend, Usain Bolt, and equal with Yohan Blake.