Jamaica's Usain Bolt hopes to become the first man since Carl Lewis in 1984 to win an Olympic sprint double today.
The man whose father says owes his speed to the yam local vegetable has already won the showpiece 100 metres final in swashbuckling style, thumping his chest before the finish.
If he also carries off his preferred 200m in Beijing's Bird's Nest at 3.20pm (Irish time) - and nobody looks capable of beating him - Bolt will equal the legendary American, not that it's obvious from his incredibly relaxed demeanour.
"I like to enjoy what I do," said the lanky Bolt, who breezed through his 200m semi-final yesterday, playing up to TV cameras and taking a look round at competitors during the race.
"You can't be too serious in your job."
Bolt, who runs the 200m final the day before his 22nd birthday, faces a tough challenge though to beat Michael Johnson's 12-year-old world record of 19.32 seconds.
The Jamaican's best is 19.67 but Johnson himself is confident his record will be broken.