Reigning 100-metre champion Yohan Blake of Jamaica has pulled out of next month's World Athletics Championships in Moscow with a hamstring injury.
The injury also kept the 23-year-old out of last month's Jamaican trials.
Blake's withdrawal adds to the list of big names who would miss the World Championships, reports Xinhua.
On Sunday, American sprinter Tyson Gay, former 100m world record holder Asafa Powell and Olympic gold medallist Sherone Simpson, of Jamaica, said they had tested positive for banned substances.
Blake ran a personal best of 9.60 seconds, tying with Gay's 9.69 personal best as the second fastest in history, just behind Jamaican Usain Bolt.