Stylish Bolt tops 100m qualifiers

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Video - Bolt strolls through to 100m semis

Jamaica's Usain Bolt looked impressive as he set the fastest time to advance to Saturday's men's 100m semi-finals.

The 21-year-old looked relaxed as he clocked 9.92 seconds to win his heat, as did compatriot Asafa Powell, who eased across the line in 10.02secs.

American Tyson Gay was second in his heat but seemed to be troubled by his long-standing hamstring injury.

Tyrone Edgar qualified but fellow Britons Simeon Williamson and Craig Pickering failed to advance.

Williamson finished fourth in his heat in 10.32 while Pickering clocked a season's best of 10.18 but was only fifth in the same heat as Bolt.

606: DEBATE I wouldn't be surprised if Gay doesn't even medal. G1

The qualifiers are in action in the semi-finals at 1305 BST on Saturday, with the final two-and-a-half hours later.

Bolt, the world record holder, eased up at the halfway point of his heat to finish ahead of American Darvis Patton, who was second in 10.04.

"It was good - I got a good start and there is lots more left in the tank," Bolt told BBC Sport.

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Video - Johnson blown away by Bolt

Gay injured his hamstring at the US trials six weeks ago and had not run competitively since.

He also eased up well before the finish line to finish runner-up behind Richard Thompson of Trinidad and Tobago in 10.09 seconds.

"I felt good and relaxed. I just wanted to make it through," Gay said.

Former Olympic champion and BBC summariser Michael Johnson was amazed by the performance of Bolt.

"I've never seen anything like that before. At this stage we're pretty much guaranteed to have a world record in the 100m and Usain is pretty much guaranteed a gold medal," he said.

"This year his start has improved and everything is just flawless with him at this point. It's amazing to watch.

"I don't think he will feel the pressure and he is running away so easily from the rest of the field.

"I thought Asafa Powell looked better than he did in the first round and that run will give him confidence going into the semi-finals and finals.

"I don't think he can beat Bolt, but I think he will live up to his expectations and win silver.

"Tyson Gay does not look race-sharp and that is what I was afraid of. That could really come into play in the semi-finals and I don't think he has enough time to recover."