(FromL) Poland's Joanna Jozwik, Britain's Shelayna Oskan-Clarke, Switzerland's Selina Buchel and Canada's Melissa Bishop compete in the Women's 800m Semifinal during the athletics event at the Rio 2016 Olympic Games at the Olympic Stadium in Rio de Janeiro on August 18, 2016.   / AFP / PEDRO UGARTE        (Photo credit should read PEDRO UGARTE/AFP/Getty Images)