United States sprint star Tyson Gay is set to miss out on the chance to challenge Usain Bolt for the 100 metres title at this year’s World Championships.

Usain Bolt will revert to the 100 metres in Toronto next month following his blistering performance at the recent Bupa Manchester 150m street sprint.

James Ellington failed to get a medal in last night’s 100m final at the IAAF World Junior Championships, but left the stadium in Grosseto with his head held high.