Usain Bolt is aiming to run under 10 seconds for the first time this season at the Golden Spike meet today.

The Jamaican sprinter ran 10 seconds flat to win a 100-metre race in Toronto on Thursday.

In May, he timed 14.35 in the rarely run 150m on a temporary street track in Manchester, England, to break Donovan Bailey's 12-year-old world record of 14.99.

Both races were held in wet weather and were Bolt's first since requiring minor surgery on his left foot after crashing his car into a ditch in April.

This time, the weather is forecast to be fine and Bolt is looking to set a marker for the World Championships at Berlin in August.

Looking to run 9.8

"It should be good tomorrow, definitely. For me, 9.8 will be good," Bolt said. "I'm liking the weather and I'm hoping that tomorrow will be like this.

"(I'm) not in the same shape as last year at the same time, but I'mreally focused and I'm working really hard to get where I was last season. My main aim is the World Championship. That's what I'm working towards."

Bolt set world records in the 100m and 200m at last year's Beijing Olympics and was part of the Jamaican team that broke the world mark in the 4x100m relay.

He ran 9.69 in the 100 at the Games and thinks it can be lowered, although he doesn't expect that in Berlin.

"There's always a limit. I'm sure it's somewhere 9.50," Bolt said. "The Olympics was just something special. I don't think I would need to break the world record to win (in Berlin)."

To do that, Bolt knows that he has to improve.

"My start is the weakest part of my 100 metres," he said. "I really put emphasis on that."

Bolt, who headlines the meet in the eastern Czech city of Ostrava that includes eight Olympic champions from Beijing, will reportedly earn about $250,000 for his participation. If he sets a world record, he will receive another $100,000, organisers said.

He is set to race at Jamaica's national championships and meets in Switzerland, Paris and London before the World Champs.