Fierceness is the lone runner and winner of three foals of racing age out of the winning Stay Thirsty mare Nonna Bella.

[4] Repole raced both Nonna Bella and Stay Thirsty and is a shareholder in Fierceness's sire City of Light, who stands next year at Lane's End Farm in Versailles, Kentucky for $35,000.

[4] Fierceness' full-brother 'Mentee' of Mike Repole's stable, in his June 15 debut in the seventh race of a five-furlong maiden special weight at Aqueduct Racetrack was ridden by John Velazquez and trained by Todd Pletcher.

On the sealed, muddy track, he shook off his competition, extending his lead before being geared down by jockey Jose Ortiz to win by 11+1⁄4 lengths in a time 1:09.56.

A check-up after the race revealed nothing amiss with the colt, so trainer Todd Pletcher and owner Mike Repole decided to consider the Breeders' Cup Juvenile.

The horse trained at Keeneland in company with stablemates and was shipped to Santa Anita Park for the Breeders' Cup on October 28.

He opened up a two-length lead ahead of a rallying Muth an eighth of a mile before the finish and continued to extend the margin to a 6+1⁄4 lengths victory in a fast time of 1:41.90.

In the stretch run he turned on another gear and blasted away to win by a record margin of thirteen-and-a-half lengths for the event in a brisk time of 1:48.22.

The win was the second straight for trainer Todd A. Pletcher and owner Repole Stable, who took last year's event with 2022 champion 2-year-old male in Forte.