The Jamaican superstar ran an Olympic-record time of 9.63 to become the fastest man yet again over the distance in London.
Here’s what else happened on this day:
1970: Manchester United became the first senior team in British football to win a competitive match by a penalty shoot-out. Their Watney Cup semi-final against Hull stood at 1-1 after 90 minutes before United triumphed 4-3 on penalties.
1978: Aberdeen’s new Pittodrie Stadium, the first all-seater stadium in Britain, was inaugurated by a friendly between the Dons and Tottenham.
1990: Tom Kite won the Federal Express St Jude Classic at Memphis to become the first golfer to win USD 6million (£3.6million) on the US PGA Tour.
2003: Darren Gough announced his retirement from Test cricket.
2004: Sven-Goran Eriksson was cleared of any wrongdoing by the Football Association following an investigation into the Faria Alam scandal.
2009: Sunderland completed the £10million signing of Darren Bent from Tottenham.
2013: Manchester United confirmed they had rejected a second bid from Chelsea for striker Wayne Rooney, while Walter Smith resigned as Rangers chairman.
2014: Bayern Munich announced they had agreed a deal with Liverpool to sign goalkeeper Jose Reina.