RIO DE JANEIRO, BRAZIL - AUGUST 17:  (L-R) Shelayna Oskan-Clarke of Great Britain, Ajee Wilson of the United States and Caster Semenya of South Africa compete in the Women's 800m - Round 1 heats on Day 12 of the Rio 2016 Olympic Games at the Olympic Stadium on August 17, 2016 in Rio de Janeiro, Brazil.  (Photo by Ian Walton/Getty Images)