1985: two-year-old season Moon Madness made his only appearance as a two-year-old in a maiden race at
Goodwood Racecourse in which he finished fourth, beaten four and half lengths by Faraway Dancer, a colt who went on to finish fourth in the following year's
Epsom Derby.
Timeform described him as colt who was "likely to improve".
1986: three-year-old season Moon Madness began his three-year-old season by winning minor handicap races including victories at
Newmarket and
Haydock. He recorded his first important success when winning the
King George V Stakes, a handicap race for three-year-olds at
Royal Ascot in "impressive" style. He was then moved up to
Listed class and won the Scottish Derby at
Ayr. In August he was sent to
York to contest the
Great Voltigeur Stakes, an important trial race for the St Leger in which he finished third behind Nisnas and Mashkour. It was his first defeat after five successive wins. In the St Leger at
Doncaster Racecourse, Moon Madness started 9/2 third favourite in a field of eight runners with the filly Untold, winner of the
Yorkshire Oaks being made favourite. Ridden by
Pat Eddery, Moon Madness drew away from his opponents in the straight to win "comfortably" by four lengths from Celestial Storm and Untold. Later that autumn he finished third to Allez Milord and Baby Turk in the
Preis von Europa.
1987: four-year-old season As a four-year-old, Moon Madness began by finishing fourth to
Mtoto in the
Brigadier Gerard Stakes from the future
Prix de l'Arc de Triomphe winner
Tony Bin. He returned to England to contest the
King George VI and Queen Elizabeth Stakes, but finished unplaced behind
Reference Point. In August, Moon Madness won the
Geoffrey Freer Stakes, beating a field which included Legal Bid and Ibn Bey (runner-up in the
Breeders' Cup Classic). In Autumn, Moon Madness was sent to Germany where he finished second to
Acatenango in the
Grosser Preis von Baden. At Ascot he won his third major prize of the season when he won the
Cumberland Lodge Stakes from Knockando and Mashkour, being given "perfect handling" by Eddery to win from the front. On his final appearance of the year he led the field for much of the way in the
Japan Cup before being overtaken in the straight and finishing fifth.
1988: five-year-old season On his 1988 debut, Moon Madness started the 6/5 favourite for the Yorkshire Cup and won "smoothly" by one and a half lengths from Lake Erie In June, Moon Madness finished third behind
Triptych in the Coronation Cup at Epsom and third again behind Almaarad in the
Hardwicke Stakes at Royal Ascot. He finished last of the ten runners behind
Mtoto in the King George VI and Queen Elizabeth Stakes, and was sixth behind Top Class in the Geoffrey Freer Stakes. In his last race, Moon Madness ran for the second time in the Japan Cup, finishing sixth behind
Pay the Butler. ==Stud career==