The United States' Allyson Felix (right) winning the women's 400 metres semi-final ahead of The Bahamas' Shaunae Miller (left) and Jamaica's Christine Day, inside the Olympic Stadium in Rio de Janeiro yesterday.
Shericka Jackson (left) winning her women's 400m semi-final ahead of the United States' Natasha Hastings (right) at the Olympic Stadium in Rio de Janeiro, Brazil, yesterday..
