Sports Kentucky Derby 2013: 'Run for the Roses' a wide-open affair (+video)

A number of three-year-old horses entered in this year's Kentucky Derby will have an opportunity Saturday to capture the garland of roses given to the winner.

Garry Jones/AP/File

Saturday marks the 139th running of the Kentucky Derby at Churchill Downs in Louisville, Ky. Nineteen three-year-old horses will go to the post late in the day for the first leg of racing's Triple Crown.