He is best remembered for his win over Bustino in the King George VI and Queen Elizabeth Diamond Stakes, which has been described[1] as Britain's "Race of the Century".

He was a son of Great Nephew who also sired Epsom Derby winner Shergar and the Canadian Horse Racing Hall of Fame filly, Carotene.

[3] His dam, Word From Lundy, was a daughter of the French runner Worden, whose wins included Italy's Premio Roma and the 1953 Washington, D.C. International Stakes in the United States.

Racing on soft ground for the first time, Grundy went to the front two furlongs from the finish and pulled clear to beat Steel Heart by six lengths.

Grundy's preparation for the British Classic Races was interrupted in March by a training accident at Seven Barrows when he was kicked in the face by another three-year-old colt, Corby.

In the 2000 Guineas at Newmarket, Grundy started 7/2 favourite in a field of 24 runners but finished second again, beaten half a length by the 33/1 outsider Bolkonski.

Grundy overtook the front-running Anne's Pretender to take the lead a furlong and a half from the finish and pulled clear to win by three lengths from the filly Nobiliary with Hunza Dancer in third.

Despite trailing in seventh place coming into the home straight,[11] he broke away from the field in the closing stages and won decisively by two lengths from King Pellinore and Anne's Pretender.

[12] In The Observer's list of the "10 greatest horse races of all time," the match between Grundy and Bustino in the King George VI and Queen Elizabeth Stakes at Ascot Racecourse on July 26, 1975 was ranked number two.

Three-year-old Grundy started 5/4 on[13] favourite against a very solid field in the King George VI and Queen Elizabeth Stakes that was open to older horses.

Bustino's two pacemaker stablemates, Highest and Kinglet, set a blistering early pace in the 2,414 metre (1½ miles) race that was designed to wear down Grundy, to diminish his trademark finishing acceleration.

The two horses began pulling away from the rest of the field and with a furlong left to run, Grundy caught and passed Bustino who in turn refused to quit and retook the lead.

He failed to reproduce anything approaching his best form, however, and finished a tired fourth behind Dahlia, Card King and Star Appeal, all of whom he had beaten comfortably at Ascot.