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Classic Empire should be the leading contender to win this year’s Kentucky Derby, but there is one small caveat. He doesn’t always like to run.

The reigning 2-year-old champion has earned more than $1.5 million and has a strong pedigree as a son of Pioneerof the Nile, who also sired Triple Crown winner American Pharoah.

But ahead of Saturday’s Arkansas Derby, in which Classic Empire will need a top-four finish to secure a spot…