As if there was ever any doubt.
Usain Bolt further cemented his status as the greatest sprinter of all-time on Sunday, dominating the fastest ever Olympic 100m final against his training partner Yohan Blake and the best the United States had to offer.
Bolt started conservatively but had broken clear with 40 metres to go before powering away to win in 9.63 seconds.
It was the second quickest time ever recorded, behind only Bolt's own winning effort of 9.58 at the 2009 world championships in Berlin.
The minor medals went to Blake (9.75) and American Justin Gatlin (9.79) in a race where the top seven finishers all broke the 10-second barrier.
Bolt, 25, had seemed unusually vulnerable coming into the London Games.
He was sensationally disqualified for a false start in the 100m final at last year's world titles and was beaten by Blake in the 100m and 200m at the Jamaican trials.
There was also a suggestion of a hamstring injury.
But when the big moment came, Bolt delivered in spades.
"I'm not concerned (about the doubters)," said Bolt, who became only the second man after Carl Lewis in 1988 to successfully defend the Olympic 100m title.
"I've said it from the start, people can talk, all they can do is talk.
"I tell you people that when it comes to the championships it's all about business to me and I brought it."
He and silver medallist Blake got together for some riotous post-race celebrations and a joyous lap of honour before another heaving capacity crowd of 80,000 at the Olympic Stadium.
"I knew it was going to be like this," said Bolt.
"There wasn't a doubt in my mind that it was going to be loud and it was going to be great and you can feel that energy.
"... I have to give thanks to Blake also.
"He always pushes me. He's worked harder than me.
"But when it comes to business I do what I have to do. I have a great talent."
Bronze medallist Gatlin had won the 2004 Olympic 100m title before serving a four-year doping ban.
Fellow Americans Tyson Gay and Ryan Bailey were fourth and fifth, but in reality they were all bit players in the Bolt Show.
Bolt emulated the effort of fellow Jamaican Shelly-Ann Fraser-Pryce, who successfully defended her women's 100m title on Saturday.
And Bolt will be at the shortest of odds to repeat the dose in the 200m, the 4x100m relay and - perhaps - the 4x400m relay later in the Games.
Ezekiel Kemboi also turned on a show after claiming yet another Olympic 3000m steeplechase title for Kenya.
With the gold medal in his grasp, Kemboi veered across the track and crossed the finish line in lane eight ahead of Frenchman Mahiedine Mekhissi-Benabbad, with the two swapping singlets after the race.
Kemboi, the two-time reigning world champion, called his post-race dance routine "mini Bolt".
American Sanya Richards-Ross won a first Olympic individual title in the women's 400m, holding off the challenge of fast-finishing Briton Christine Ohuruogu, who had endured a tough few years since winning gold in Beijing in 2008.
Richards-Ross clocked a winning time of 49.55 ahead of Ohuruogu (49.70) and American DeeDee Trotter (49.72).
The other gold medals decided on Sunday evening went to Krisztian Pars from Hungary in the men's hammer throw and Kazakhstan's Olga Rypakova in the women's triple jump.
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