(L-R) Spain's Caridad Jerez, Britain's Tiffany Porter and Paraguay's Ana Camila Pirelli compete in a heat of the women's 100 metres hurdles athletics event at the 2015 IAAF World Championships at the "Bird's Nest" National Stadium in Beijing on August 27, 2015. AFP PHOTO / PEDRO UGARTE (Photo credit should read PEDRO UGARTE/AFP via Getty Images)
