World's Best Racehorse Rankings
Unbridled was grandsire through Unbridled's Song of the filly Eight Belles, who finished second at the 2008 Kentucky Derby but broke both front pasterns at the finish and was euthanized on the track, and of the colt Arrogate, who won the 2016 Breeders' Cup Classic and placed first in the World's Best Racehorse Rankings for that year. By his daughter Oatsee, he was also the broodmare sire of Shackleford, winner of the 2011 Preakness Stakes.