World 100 metres champion Yohan Blake will not defend his title at next month's World Athletics Championships in Moscow due to a nagging hamstring injury, his manager said on Tuesday.
"This decision was made after continual assessment and re-evaluations since his withdrawal from the Jamaican Senior Championships," Cubie Seegobin said.
"Yohan has made vast improvement, although the injury sustained in April of this year has prevented him from attaining the necessary fitness levels that we have grown accustomed to seeing in his competition performances."
Blake won the world 100m title in Daegu, South Korea, in 2011 following the disqualification of compatriot Usain Bolt for a false start.