Tim Layden, of sportsillustrated.com, has a preview of the 137th running of the Kentucky Derby, set for Saturday, at Churchill Downs, in Louisville, Ky., below.

Nehro is lead on to the track in preparation for the 137th Kentucky Derby at Churchill Downs on May 5, 2011 in Louisville, Kentucky.

Trainers preparing for the Kentucky Derby keep saying the same thing, over and over again. The race is wide open. There was Kiaran McLaughlin, a Kentucky native who saddled 2006 Belmont Stakes winner Jazil, standing in the morning cold and wind Wednesday on the Churchill Downs backstretch.

"It's about as open as you can get,'' McLaughlin said. "Ten horses. Maybe 12, can win it.''