If Usain Bolt wasn't already an Olympic legend, he reminded us once again with his victory in the 200m last night.
No athlete has ever done the double double of winning the 100 and 200m at successive Olympic Games.
Like any great champion he silenced the doubters just when people thought he might be vulnerable to his training partner Yohann Blake.
The big question now is what's left for Bolt to achieve?
As an athletics fan, Bolt is without question the best thing that's ever happened to the sport. I feel proud that the world's biggest sports star does athletics.
But what else can he do. Defend his titles in 2016 for a triple triple? That's never been done but would it capture the world's imagination? I don't think so.
Like a lot of people I'd like to see him try the 400m but Bolt's said himself, he doesn't want to do the training which he thinks will be too hard.
There's mention of the Long Jump but I don't know how serious he is about that.
As Olympic legend Michael Johnson said on the BBC; athletics needs Usain Bolt, but he no longer need athletics.