Other medals went to Estonian Gerd Kanter, who ended Virgilijus Alekna's seven-year world reign in the men's discus with a heave of 68.94m.

Russia's Tatyana Lebedeva clinched the women's long jump title with a leap of 7.03m while American Kerron Clement won the men's 400m hurdles in a time of 47.61 seconds.

Earlier in the day Jeremy Wariner made no mistakes in his 400m heat, while Tyson Gay began his quest for a rare sprint double.

Few favourites for gold are firmer than Wariner and he has been on fire this season, improving his personal best to 43.50 seconds.

His next milestone is Michael Johnson's world record of 43.18 and he has suggested it could fall here, but was in no mood to talk about it Tuesday.

"I feel good, I am fine," he said after running 45.10 in his heat, pulling back almost to a walk before crossing the line.

"The track is good but I do not want to talk about the world record now."

The fastest through the heats was Chris Brown from Bahamas in 44.50.

Less than 48 hours after blowing away Asafa Powell to win the 100m gold, Gay lifted himself for the fastest time (20.08) in the 200m quarterfinals.

"I'm gritting my teeth," said Gay, now into Wednesday's semifinals, who had complained of feeling "sluggish" in the morning heats.

"I'm trying to be strong. Mentally and physically I'm okay, only my left hamstring is bothering me a little bit. But I'm not too worried about that."

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