TOKYO -- In the 16 years since Usain Bolt posted his world records in the 100 and 200 meters, nobody has really come close to toppling them.

One of track's all-time greats and maybe still its most-recognizable star said he looks at today's top sprinters and doesn't expect that to change anytime soon.

"No, I'm not worried," Bolt said at a Puma event Thursday, two days before the start of world championships. "I think the talent is there, there will be talented athletes coming up, and they will do well. But at this present moment, I don't see any athlete able to break the record, so not worried."

Bolt set both records -- 9.58 in the 100 and 19.19 in the 200 -- at worlds in Berlin in 2009.

Since then, only one other runner, Yohan Blake, has cracked 9.7 in the 100, and only Blake has run f

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