CALI, COLOMBIA - JULY 15:  Abdul Hakim Sani Brown of Japan, gold medal, Derick Silva of Brazil, silver medal, and Rechmial Miller of Great Britian, bronze medal, celebrate on the podium after winnning the Boys 100 Meters Final on day one of the IAAF World Youth Championships, Cali 2015 on July 15, 2015 at the Pascual Guerrero Olympic Stadium in Cali, Colombia.  (Photo by Buda Mendes/Getty Images for IAAF)