"If I get a good start ... it won't be a problem for me," Bolt told reporters in South Korea. "I think I will win with ease. When I get into my running stride I don't think anybody can match it, no matter my shape."

The powerful Jamaican went on to underline that his main focus this time round is the defence of his titles and not records.

"There won't be any records here," said Bolt. "Just to defend my titles, that is the main aim for me."

The preliminary round of the 100m will take place on the first day of the championships on August 27 (7:45am Jamaica time) with the final on the following day. Bolt, who was forced to call an early end to his 2010 season due to injury, starts his 200-metre title defence on September 3.

"A lot of people will be wanting a fast time so I think 9.7 (seconds) should be good," he said in reference to his thoughts on what will be a good enough time for the 100m title.

Bolt, who has so far only managed a best of 9.88 over 100m and is at present, the seventh fastest man in the world, with compatriot and gold medal contender Asafa Powell leading the way with 9.78, blames his injury setback for his less-than-spectacular showing this season.

"The injury kind of threw me off a lot," said Bolt. "I really couldn't push myself early season because you have to take it slowly. You can't really rush back into it."

Injuries aside, Bolt believes that his start is always his biggest issue but reported that his training has been coming along well and that he expects to do much better at the championship and also praised the reception and warmth of the Korean people.

"It was like starting over for me for the start, Bolt said. "It's hard to run when you are race rusty so to me it is just getting back into running."

"When I came here I felt that emotion," he said. "When I saw people cheering for me in the airport I could feel that championship vibe coming on," Bolt said.