Trainer Steve Asmussen watches as Kentucky Derby entrant Epicenter works out in the rain at Churchill Downs Tuesday. The 148th running of the Kentucky Derby is scheduled for Saturday at the famed Lexington, Ky., track. (Charlie Riedel/AP PHOTO)
By Gary B. Graves AP SPORTS WRITER LOUISVILLE, Ky. (AP) — Zandon and filly Nest were the mid-week morning-line favorites for the 148th Kentucky Derby…