Last night, Usain Bolt won a 3rd consecutive Olympic 100-metre title. The Jamaican won gold in a time of 9-point-eight-one seconds.
South Africa's Wayde van Niekerk smashed Michael Johnson's 17-year old 400-metres record.
In other track news, Down's Ciara Mageean failed to reach the 1500 metres final.
She placed 11th in her semi final, in a time just two-hundredths of a second off her season's best.
