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Usain Bolt made history on Sunday night by winning the men's Olympic 100 metres for the third time in a time of 9.81seconds.
The Jamaican superstar was slowly out of the blocks but his superiority over the second 50metres proved decisive as he powered away to see off the challenge of American Justin Gatlin and Canada's Andre de Grasse.
Gatlin had been booed as he made his way to the starting blocks at the Olympic Stadium but for a time it looked as though he would have the final word as he led the field through to the half-way point, but Bolt took it up at the 60m mark to claim a seventh Olympic title.
"Somebody said I can become immortal. Two more medals to go and I can sign off. Immortal," said Bolt, who is planning to retire after the 2017 World Championships.
"It wasn't perfect today, but I got it done and I'm pretty proud of what I've achieved. Nobody else has done it or even attempted it.
"I expected to go faster, but I'm happy that I won. I did what I had to."
"After the semi-final, I felt extremely good.
"I wanted to run faster but with the turnaround time - we normally have two hours but we had one hour 20 minutes - it was challenging. This is what we train for. I told you guys I was going to do it. Stay tuned. Two more to go (200m and 4x100m relay."
Earlier, South Afrida's Wayde van Niekerk broke Michael Johnson's 17-year-old 400m world record by storming to victory in Rio.
The 24-year-old took gold in a time of 43.03 to shave 0.15seconds off Johnson's record with Grenada's Kirani James taking silver and American LaShawn Merritt securing bronze.
"I have dreamed of this since I was a kid," van Niekerk said.
"I believed it was possible. I am just glad things went my way. I thank Michael Johnson for setting such a great example for us. I just did my best."
There was disappointment for Ireland's Ciara Mageean in the women's 1500m semi-final.
Mageean needed to finish in the top five in order to book her place in the final but the Irish athlete could only finish in 11th.
Having positioned herself in second place Mageean was well placed to challenge at the bell, but she struggled to keep up with the pace and drifted down the field before crossing the line in 11th.
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