You have to give Justin Gatlin credit: right now he is the best sprinter in the world.
He's also the most consistent, adding this world title to his Olympic gold from last year.
Gatlin was in trouble in the final.
Gatlin celebrates his world title
But he was able to come back and keep his poise, and then just take control of the race and completely separate himself from this field.
Leonard Scott got a great start, but he began to fade really fast at 50 metres because his head and upper body got so far ahead of his legs, so he could generate almost no power.
By contrast, Gatlin's head was over his body, and that's what helped him to the victory.
Anything could have gone wrong out there, but he was able to put it all together.
He came into the Worlds with a lot of confidence, and he was able to gain more and more confidence during the rounds because he never put a foot wrong.
He knew Scott was going to get a great start, and he could see athletes like Aziz Zakari come through and run very well in the semis.
But he wasn't fazed by that, and he was able to come through and take a great victory.
He reminds me a little of former world and Olympic champion Donovan Bailey, in that he runs with a slapping motion of the feet.
Kim Collins is a guy who just won't go away
It's very different from the rest of the guys. Well, now he has the same titles as Donovan too.
Silver and bronze
It was a surprise to see Michael Frater take silver.
He had been running well, but you didn't figure on 10.07secs taking second place.
You knew he could run that time, but that shouldn't have been enough.
But that was a great race for him.
The biggest surprise was Kim Collins taking bronze - and nearly silver.
This is a guy who just won't go away. He's a championship performer.
He won't go down as one of the greatest 100m runners of all time, becuase he hasn't produced the times.
But when it's time to run, he's always there.
He looked pretty bad in the earlier rounds - I didn't think he was going to even make it into the semi-final.
Then he goes and gets into the final and then gets a medal!
I love to see him race, and it was great to see him take bronze.
But that doesn't change the fact that there is a huge gap between Gatlin and Asafa Powell and the rest of these guys.
Michael Johnson was speaking on BBC Television.