Lutkenhaus, 17, beats Olympic 800m champion Wanyonyi

American teenager Cooper Lutkenhaus, aged 17, produced a stunning upset at the Diamond League meeting in Oslo, defeating Olympic 800m champion Emmanuel Wanyonyi of Kenya in the men's 800m event. The result marks a remarkable achievement for the young American against one of the world's top middle-distance runners. Meanwhile, fellow teenage sensation Gout Gout struggled in the 200m at the same meeting.