(L-R) Grenada's Bralon Taplin, Chad's Bachir Mahamat, Egypt's Anas Beshr, and Costa Rica's Nery Brenes Cardenas compete in the Men's 400m Round 1 during the athletics event at the Rio 2016 Olympic Games at the Olympic Stadium in Rio de Janeiro on August 12, 2016. / AFP / Jewel SAMAD (Photo credit should read JEWEL SAMAD/AFP via Getty Images)
Costa Rica's Nery Brenes Cardenas reacts after competing in the Men's 400m Round 1 during the athletics event at the Rio 2016 Olympic Games at the Olympic Stadium in Rio de Janeiro on August 12, 2016. / AFP / OLIVIER MORIN (Photo credit should read OLIVIER MORIN/AFP via Getty Images)
(L-R) USA's Gil Roberts, Jamaica's Fitzroy Dunkley, Venezuela's Albert Bravo, Cuba's Yoandys Lescay, and Belgium's Kevin Borlee compete in the Men's 400m Round 1 during the athletics event at the Rio 2016 Olympic Games at the Olympic Stadium in Rio de Janeiro on August 12, 2016. / AFP / Jewel SAMAD (Photo credit should read JEWEL SAMAD/AFP via Getty Images)
South Africa's Wayde van Niekerk (L) shakes hands with Belgium's Jonathan Borlee after they competed in the Men's 400m Round 1 during the athletics event at the Rio 2016 Olympic Games at the Olympic Stadium in Rio de Janeiro on August 12, 2016. / AFP / OLIVIER MORIN (Photo credit should read OLIVIER MORIN/AFP via Getty Images)
(FromL) Grenada's Bralon Taplin, Kenya's Raymond Kibet, Costa Rica's Nery Brenes Cardenas and Italy's Matteo Galvan compete in the Men's 400m Round 1 during the athletics event at the Rio 2016 Olympic Games at the Olympic Stadium in Rio de Janeiro on August 12, 2016. / AFP / OLIVIER MORIN (Photo credit should read OLIVIER MORIN/AFP via Getty Images)
