A big day for Kenya with two gold medals: One for David Rudisha, the king of the men’s 800 meters run, and a surprising one to Nicolas Bett in the men’s 400 meters hurdles. Greg Rutherford of Great Britain won the long jump competition, like he did in the Olympics, Genzebe Dibaba of Ethiopia won the women’s 1500 meters and Denia Caballero of Cuba took gold in the women’s discus throw.