Wayde Van Niekerk breaks Michael Johnson's 400m world record

24-year-old​ Wayde van Niekerk of South Africa won the men's 400 metres gold in a world record time of 43.03 seconds His time beat the previous world mark of 43.18 seconds set by Michael Johnson in 1999 He also became the first person ever to win a world or Olympic 400-meter race from lane 8