Four years on from storming to Olympic gold in a seemingly effortless world record time, either Usain Bolt will again be hailed a great champion or a new 100 metres sprint king will be crowned in London on Sunday.
The Jamaican triple gold medallist from Beijing has had his
sprint authority challenged with the emergence of younger
compatriot Yohan Blake, who took his friend and training
partner's world title in Daegu, South Korea last year when Bolt
false started, and set the world's leading mark this year.
Bolt came into the Games with questions over his fitness but
enjoyed nothing more than a light workout when cantering through his first round heat on Saturday despite making a sloppy start.
If all the leading protagonists safely negotiate semi-final
passage, the final (2055) has the makings of one of the all-time greats with a fast London track offering hope of a new world record.
Al Jazeera's Andy Richardson reports from London.
