The Ones to Beat

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WOLFGANG KUMM/EPA/DPA/AFP

World champion and world record holder Marion Jones

There are many obstacles to winning a gold medal and here are some of the biggest. At the pool, it's the astounding Aussie Ian Thorpe. In wrestling, Russia's Alex Karelin has never lost a match. The 400-m run—hello Mr. Johnson. Beyond them all, there's the multiple challenge of Marion Jones.

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