Mark Casse is one of the most accomplished Thoroughbred trainers in modern horse racing, with a career spanning more than four decades. Known for developing elite champions on both sides of the U.S.–Canadian border, his stable has produced some of the sport's most celebrated runners, including Tepin, Catch a Glimpse, and War of Will. In 2019, Casse captured the Preakness Stakes and Belmont Stakes with War of Will and Sir Winston, cementing his place among the sport's elite trainers. Over the course of his career he has amassed thousands of victories and hundreds of graded stakes wins, with horses earning hundreds of millions in purse money. A dual Hall of Fame inductee in the United States and Canada, Casse's legacy continues to shape the sport through his dedication to horsemanship, excellence, and the next generation of racing talent.
Mark Casse saddles his first winner as a trainer, beginning a legacy that would span more than four decades.
Lexie Lou captures Canada's most prestigious race, the Queen's Plate, adding to Casse's growing trophy shelf.
Catch a Glimpse wins the Breeders' Cup Juvenile Fillies Turf, announcing Casse's dominance on the international stage.
Tepin becomes the first North American-trained filly to win the Queen Anne Stakes at Royal Ascot — a historic milestone.
War of Will wins the Preakness Stakes, with Sir Winston taking the Belmont — a crowning Triple Crown season for Casse.
Mark Casse is inducted into the U.S. Racing Hall of Fame, joining a dual Canadian honour to cement an unparalleled legacy.
Reached a new career high earnings record in 2025 surpassing over $23,000,000 in earnings.