A wet track looks like a given for the Kentucky Derby at this point; below are some off track pedigree tidbits:

Curlin is the sire of Good Magic, Solomini and Vino Rosso: over the past five years on off tracks, his progeny are 84/425 (20%)
Medaglia d'Oro is the sire of Bolt d'Oro and Enticed: over the past five years on off tracks, his progeny are 65/380 (17%)
Scat Daddy is the sire of Flameaway, Justify, Mendelssohn and Combatant: over the past five years on off tracks, his progeny are 80/497 (16%)

Audible's dam (Blue Devil Bel): 2/3 in mud/slop
Bolt d'Oro's dam (Globe Trot): 0/3 in mud/slop, but 3/3 ITM
Enticed's dam (It's Tricky): 2/4 in mud/slop, 4/4 in the exacta
Bravazo's dam (Tiz o' Gold): 1/2 in mud/slop
Mendelssohn's dam (Leslie's Lady): 0/3 in mud/slop
Noble Indy's dam (Noble Maz): 2/3 in mud/slop

Promises Fulfilled: 1/2 to Dave Got Even (2/3 in mud/slop)
Good Magic: 1/2 to Goodzapper (2/8 in mud/slop, 4/8 ITM)
Hofburg: 1/2 to Emollient (1/1 in mud/slop)
Bolt d'Oro: 1/2 to Sonic Mule (1/2 in mud/slop)
Combatant: 1/2 to Timeless Indy (1/4 in mud/slop, 4/4 ITM); 1/2 to Bordini (2/4 in mud/slop, 3/4 in the exacta)