ATHLETICS WORLD CHAMPIONSHIPS Venue: Olympic Stadium, Berlin Date: 15-23 August Coverage: Watch the action live and highlights on BBC Two, BBC HD, Red Button, Radio 5 live and the BBC Sport website (video for UK users only)
Full BBC coverage details
Highlights - Men's 100m quarter-finals
Triple Olympic champion Usain Bolt and American Tyson Gay both eased into Sunday's 100m semi-finals at the World Championships in Berlin.
Reigning world champion Gay stormed his quarter-final in 9.98 seconds, while Bolt was so far ahead he could share a smile with heat winner Daniel Bailey.
"I didn't need to do any more work. I was just enjoying myself," said Bolt.
British duo Dwain Chambers and Tyrone Edgar both qualified for the semis but Simeon Williamson missed out.
Former world record-holder Asafa Powell only just squeezed through his opening heat in third place, when easing up after 60m, but made no mistake in the quarter-finals, setting the fastest time of 9.95.
It was the 52nd time Powell has run under 10 seconds, equalling Maurice Greene's record.
The Jamaican could yet have a say in Sunday's final despite all the pre-Championship talk of a Gay-Bolt showdown.
Gay, the champion from Osaka in 2007, endured a miserable Olympics in 2008 after rushing back to competition from a debilitating hamstring injury.
He has set the fastest time in the world this year and believes he can break Bolt's world record of 9.69 seconds, but he appeared to be protecting a groin problem in Saturday's heats despite qualifying comfortably enough for Sunday's semis, scheduled for 1810 BST.
Chambers set his fastest time of 2009, winning his heat in 10.04.
"I'm very pleased with that," Chambers told BBC Sport.
"I was knackered after my heat this morning and as you get older it takes longer to recover.
"But I'm looking forward to Sunday now and it just feels great to be out here running."
Edgar (10.12) came second in his heat behind American Mike Rodgers who recorded a time of 10.01 to qualify for the next round and he was delighted to progress.
"I know I can run quicker and I'm going to take advantage and do that in the semi," said Edgar.
But there was disappointment for Williamson who was always up against it when being drawn in the same heat as Bolt and Bailey.
"I got cramp after the third step in both legs," said Williamson.
"They just went 'bang, bang'. I didn't feel anything when I was warming up but I will be OK for the relay."
Elsewhere, American Christian Cantwell won shot put gold with a throw of 22.03 metres. Poland's Tomasz Majewski claimed silver with Ralf Bartels of Germany winning bronze.
It is now the seventh time in eight years that America has won the shot put at the World Championships and it avenges Cantwell's loss to Majewski in the Olympics last year.
Earlier on a stifling Saturday in Berlin, Russian Olympic champion Valeriy Borchin won the first gold medal of the championships in the men's 20 km walk.
And Kenyan Linet Masai ran an outstanding final straight to take women's 10,000m gold from Ethipia's Meselech Melkamu.
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