Published: May 01, 2010 7:25 PM EDT

LOUISVILLE, Ky. (AP)- Rain in Louisville is making for a muddy track at Churchill Downs ahead of today's Kentucky Derby.

Heavy rain postponed early morning workouts at Churchill Downs, where all 20 Kentucky Derby horses are still expected to start.

Lookin At Lucky is the morning line favorite in the 20-horse field at 3-1. His trainer, Bob Baffert, is chasing a fourth win of the year's first Triple Crown race.

The 136th Kentucky Derby is scheduled to run at 6:28 p.m.