Jamaican Olympic gold medallist Usain Bolt (front) leaps ahead of British athlete Mark Lewis-Francis (L), U.S. sprinter Wallace Spearmon and Brazilian athlete Jefferson Lucindo (R) during the "Mano a Mano" men's 100 metres challenge on Copacabana beach in Rio de Janeiro August 17, 2014. REUTERS/Sergio Moraes (BRAZIL - Tags: SPORT ATHLETICS TPX IMAGES OF THE DAY)