History of Kentucky Derby winners as race for Triple Crown begins

The 151st running of the Kentucky Derby will take place later today.

But there will be plenty of activity at Chruchill Downs all Saturday before the famed horse race makes its final turn during "the most exciting two minutes in sports."

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Just 20 horses will enter the starting gate on Saturday evening, moments before they will run in the Kentucky Derby. Earning a spot on the storied Churchill Downs track isn't easy. The horses go across the U.S. and the world, competing in a series of select races. If they earn enough points, they get one of the 20 spots at the Kentucky Derby.

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