van Niekerk of South Africa and Merrit from the U.S. compete in the men's 400m event during the 15th...
Wayde van Niekerk of South Africa and LaShawn Merrit from the U.S. compete in the men's 400m event during the 15th IAAF World Championships at the National Stadium in Beijing, China August 24, 2015. REUTERS/Lucy Nicholson