The United States women’s 4×400 metres relay team, who have won seven of the last eight World Championships and the last seven Olympic golds, were disqualified from Saturday’s semi-finals after a botched baton changeover.

The U.S. were trailing Britain after three legs when Alexis Holmes initially failed to collect the baton from Quanera Hayes and by the time she got hold of it she appeared to have gone beyond the “blue box”. Read More