The richest horse race in North America belongs to Sierra Leone. Del Mar Racetrack in California played host to the $7 million Breeders' Cup Classic on Saturday, pitting the top thoroughbreds ages three years and up against each other in arguably the most stacked field of the season.

Sierra Leone won the $7 million Breeders’ Cup Classic by 1 1/2 lengths Saturday, ending a tough run of recent losses, including the Kentucky Derby.

Sierra Leone wins the Breeders' Cup Classic to deny City of Troy a glorious farewell in his last race before retiring.

Sierra Leone won the $7 million Breeders' Cup Classic Saturday at Del Mar, though a tragedy marred the closing day of the championships.

Flavien Prat rides Sierra Leone, right, past John Velazquez, riding Fierceness, in the Breeders' Cup Classic on Saturday in Del Mar, Calif.

One of the best things about 3-year-olds dominating the big races at the Breeders' Cup World Championship races is the likelihood many of them will race on around the world in 2025.

The two-day Breeders' Cup World Championships conclude Saturday at Santa Anita Park with nine races, including the $6 million Breeders' Cup Classic with Arabian Knight the 3-1 morning line favorite. The Bob Baffert-trained 3-year-old colt began his career 364 days ago with a 7 1/4-length victory in the opening race on the Saturday Breeders' Cup