Usain Bolt's coach Glen Mills believes the Jamaican sprint marvel was on track to run 9.52 seconds in the 100 metres at the Beijing Olympics, had he not eased up to celebrate at the finish.

Bolt clocked 9.69 seconds to win gold in a world record breaking performance but slowed to celebrate the phenomenal win 10 metres before the finish.

"Bolt's first 60 metres was very good. I was told that with an all-out finish after the opening 60 metres, Usain was projected to run a 9.52," Mills told reporters ahead of today's Weltklasse Golden League meeting in Zurich.

"I haven't seen the complete biomechanical report from Beijing yet, but I can say that Usain had a good start by his own standard."

Meanwhile, any doubts as to whether Bolt would continue to run the 100 metres after his incredible season this year were put to rest by Mills.

"This is only his first year of running the 100 metres, his first year with serious work in the event," said Mills.

"In two more years he should be peaking at this distance and by then I am certain he will be down to there (9.50 or faster)."

Bolt is set to light up a sold-out Letzigrund Stadium when he goes head-to-head with some of the men who finished behind him in the 100 metres in Beijing.

Trinidad and Tobago's Richard Thompson, who took silver behind Bolt, and American Walter Dix, the bronze medal winner, will be out to avenge their defeat to the Jamaican in the rematch.