Source:  Kentuckyderby.com/Brisnet

Toby's Corner, winner of the Wood Memorial (G1) has sustained an undiagnosed lameness following his final workout for the Derby.  

The horse was examined by veterinarians, but no specific injury was found.  He has been withdrawn from the Derby.

Derby Kitten, winner of the Lexington Stakes (G3), will move up to the 20th starting position.

For more details, check Kentuckyderby.com.