BEIJING, CHINA - AUGUST 22: Michael Tinsley of the United States (L) and Boniface Mucheru Tumuti of Kenya compete in the Men's 400 metres hurdles heats during day one of the 15th IAAF World Athletics Championships Beijing 2015 at Beijing National Stadium on August 22, 2015 in Beijing, China. (Photo by Christian Petersen/Getty Images for IAAF)
