Former world champion Kim Collins said he would not race in Saturday's Olympic 100 metres heats and will never run for St Kitts & Nevis again after an apparent fallout with the country's officials.

After a qualifying ordeal that bordered on preposterous, double-amputee sprinter Oscar Pistorius finally got to make his Olympic debut against able-bodied athletes on Saturday, finishing second in the 400m to advance to the semifinals.

Defending champion LaShawn Merritt of the U.S. pulled up in the backstretch of his 400-meter preliminary heat, stopped in his quest for a second straight Olympic title by an ailing left hamstring.

David Rudisha, the 800 metres world-record holder, will follow in his father's footsteps when he runs in the 4x400 metres relay at the London Olympics, the Kenyan said on Saturday.

It was only a morning 400-meter heat but Oscar Pistorius took a big step in Olympic history Saturday, becoming the first double amputee runner to compete in the Olympics.

U.S. Seeks to Lift Athletes After Management Missteps
By SARA GERMANO, JOHN CARREYROU and SCOTT CACCIOLA
LONDON—America's track and field team enters the London Games in a funk.
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'Restless' Majewski makes history in London
London, UK - Tomasz Majewski is restless – which means 6ft 8in and 21 stone of restlessness. An hour after becoming the first man to win back-to-back Olympic Shot Put titles since Parry O’Brien, ...

Canadian track and field athletes in action on day 2

 
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Armstrong 5th in shot put; Zelinka 3rd after day one of athletics at Olympic Games

 
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All anyone's talking about ahead of the men's 100 meters is the showdown between Olympic champion Usain Bolt and world champion Yohan Blake, a pair of Jamaicans who train together.