Usain Bolt has cemented his place as the world's fastest man, becoming the first athlete in history to win three Olympic gold medals in the 100-metre sprint.Bolt received a roar from the crowd as he lined up to make history in the men's 100-metre sprint. The Jamaican superstar then powered home in 9.81 seconds to claim gold. The silver went to the United States' Justin Gatlin and the bronze to Canada's Andre de Grasse. But no-one could touch Bolt, who became the first athlete in Olympic history to win three gold medals in the sprint.

