|Pants On Fire (Matthew Stockman/Getty Images)|
The entry box closed Wednesday morning, with the draw to determine post positions set for later in the afternoon. The field is limited to the top 20 horses based on earnings in graded stakes races.
Leading the way is Uncle Mo, who is being treated for a gastrointestinal infection. Owner Mike Repole has said if the colt isn't sufficiently recovered, then he won't run in the 1Â¼-mile Derby.
Uncle Mo galloped Wednesday and later stood in the starting gate to familiarize himself with the surroundings.
Other entries for the 137th Derby are Florida Derby winner Dialed In, Arkansas Derby winner Archarcharch and Comma to the Top, runner-up in the Santa Anita Derby.
Other horses entered are Louisiana Derby winner Pants on Fire, Santa Anita Derby winner Midnight Interlude, Soldat, Brilliant Speed, Irish import Master of Hounds, Twice the Appeal, Nehro and Mucho Macho Man.
The rest of the entries are Decisive Moment, Animal Kingdom, Stay Thirsty, Santiva, Watch Me Go, Shackleford, Twinspired, Derby Kitten, Sway Away and Ruler on Ice.