Coventry Stakes (1970) Gimcrack Stakes (1970) Dewhurst Stakes (1970) Greenham Stakes (1971) Epsom Derby (1971) Eclipse Stakes (1971) K. Elizabeth Stakes (1971) Prix de l'Arc de Triomphe (1971) Prix Ganay (1972) Coronation Cup (1972) Mill Reef (1968–1986) was a Champion Thoroughbred racehorse and sire.
He was bred in the United States but was trained in the United Kingdom throughout his racing career which lasted from 1970 to 1972.
Mill Reef won twelve of his fourteen races and finished second in the other two.
He was an outstanding two-year-old in 1970, and proved even better at three, winning The Derby, the Eclipse Stakes, the King George VI and Queen Elizabeth Stakes and the Prix de l'Arc de Triomphe.
However, after discussions with his owner prior to the race, Paul Mellon said, "Let him run, I've a feeling it will be alright." Mill Reef won by ten lengths from Green God (who was crowned champion sprinter the following year).
In a crop of outstanding two-year-olds, Mill Reef was rated 1 lb below his French conqueror My Swallow, who remained unbeaten in 7 races including all of France's top two-year-old races, and 1 lb ahead of the unbeaten Middle Park Stakes winner, Brigadier Gerard.
During a routine training gallop, however, he stumbled and shattered his foreleg.
Charles Allen, a veterinary specialist, was flown in. A triangularly shaped piece of bone about two and a half inches long was broken from the lower end of the cannon bone and was considerably displaced.Over a span of six hours, a simplified stainless-steel compression plate held by 3 screws was used to pin the broken pieces to the cannon bone.The injuries on the sesamoid bone or the rim of the pastern were avoided. Professor Edwin James Roberts performed the operation, and Mill Reef's life was saved.He was ridden by Geoff Lewis in all his fourteen races.Mellon named the horse after the Mill Reef Club, which is situated on the island of Antigua in the West Indies.The inner sesamoid bone was completely shattered, and the rim of the top of the main pastern bone was damaged.