By Tom Fordyce
BBC Sport at the 02 Arena
Asafa Powell has hit back at claims that he lacks the mental strength to win Olympic athletics gold this summer.
The former 100m world record holder is yet to win a major global title despite being the world's pre-eminent sprinter for much of the past four years.
"It doesn't scare me. The guys that I'm running against in Beijing are the same ones I run against all year," he said.
"It's no different at the Olympics - it's just a name, and you should put that aside until you cross the line."
With world champion Tyson Gay struggling with injury and new world record holder Usain Bolt yet to commit to the 100m in Beijing, Powell is in pole position to seize the Olympic crown.
The 25-year-old has also run under 10 seconds more times than any other active athlete, but is yet to convert that dominance to major medals.
Four years ago in Athens he finished only fifth, while at last summer's Worlds in Osaka he trailed in third behind Gay and Derrick Atkins.
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"The World Championships was the only final where I didn't do as expected. I made a once-in-a-lifetime mistake and it won't happen again."
Meanwhile, Powell's Jamaican compatriot Bolt says he has still not decided whether he will run the 100m in Beijing.
Bolt was considered a 200m specialist until this year and took silver over that distance at the World Championships last summer, but he made a huge breakthrough over the shorter distance in May when he ran 9.76 secs at the Jamaica Invitational and then a new world record of 9.72 secs at the Reebok Grand Prix in New York.
He has the option of running both distances at the Olympics but is currently committed only to the 200m.
"I'm running against myself - I'm the only one who can defeat myself and I don't intend to"
"Mentally I'm always strong and ready to compete, but physically it would be hard on my body.
"I've been doing the work in pre-season and during the season and I'm ready to double-up, but it's all about my coach."
Powell runs the 100m at the Aviva London Grand Prix at Crystal Palace on Friday night, in a race that has the largest cash prize - £25,000 - of any in British track history.
And he insists that the absence through injury of his American rival Gay will not affect his chances of scooping that jackpot.
"With or without Tyson I was planning to run fast," said Powell. "I'm running against myself - I'm the only one who can defeat myself and I don't intend to."
Craig Pickering and Tyrone Edgar will lead the British challenge but Simeon Williamson sits out the meeting after picking up a minor injury earlier in the week.
Bolt runs in the 200m on Saturday in a field that also includes American Wallace Spearmon and British duo Christian Malcolm and Alex Nelson.
There are 49 of the 68 athletes in the British Olympic team for Beijing competing over the two-day meeting.
Other highlights include Christine Ohuruogu taking on fellow British medal contender Nicola Sanders in the women's 400m, while Phillips Idowu can enhance his status as gold medal favourite in the men's triple jump.
Andy Baddeley face a big test against double world champion Bernard Lagat in the men's mile, which also includes Australia’s Craig Mottram.
Kelly Sotherton competes in a special Four-Event Challenge as she completes her build-up to Beijing, featuring a 100m hurdles and long jump on Friday, and a shot putt and 200m on Saturday.
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