Usain Bolt will bid farewell to athletics after the World Championships in London later this month. Michael Steele / Getty Images
Usain Bolt will bid farewell to athletics after the World Championships in London later this month. Michael Steele / Getty Images
Usain Bolt's impending farewell good for sprint rivals, bad for athletics
Jamaican superstar will hang up his spikes after the World Championships in London later this month.
