• USA's 800m medal hope Ajee Wilson out of World Championships with injury
The 21-year-old mid-distance runner Ajee Wilson of the United States have pulled out of Beijing World championships.
Prior to world championships Wilson was mentioned as possible medal contender for this month's world championships.
Wilson's season best mark of 1:57.87 in 800m is the third fastest in the world in 2015. Only defending world champion Eunice Sum of Kenya 1:56.99 and Cuba's Rose Almanza 1:57.70 have run faster than Wilson.
Molly Ludlow, who finished fourth at the U.S. trials, will replace Wilson.