South African sprinter breaks 400m world record
South Africa's Wayde van Niekerk set the first men's track and field world record at the Rio Olympics after finishing the 400-metre sprint in 43.03 seconds, surpassing American sprinter Michael Johnson's 17-year-old record of 43.18 seconds. The 24-year-old sprinter began his race in the eighth lane and surpassed the fastest eighth lane finish in Olympics' history by 1.63 seconds.