As a two-year-old, she won on her debut but was beaten in her next two races before recording her most important victory in the Group One Fillies' Mile at Ascot Racecourse.
She was descended from Overture, a British broodmare who was the ancestor of many major winners including Supreme Court, Marwell, Unite and Paean.
[5] In September 1997, the yearling filly was consigned by the Barronstown Stud to the Tattersalls sale, where she was bought for 75,000 guineas by bloodstock agent Dermot "Demi" O'Byrne on behalf of John Magnier's Coolmore organisation.
She overtook the Jim Bolger-trained favourite St Clair Ridge in the closing stages and won by a neck with Institutrice half a length away in third.
She briefly took the lead in the last quarter mile but was outpaced in the closing stages and finished fifth behind Edabiya, Fear And Greed, Crystal Downs, and Wannabe Grand.
For her final race of the year, Sunspangled was sent to England for the Group One Fillies' Mile on soft ground at Ascot Racecourse on 27 September.
Sunspangled was retired from racing to become a broodmare for the Coolmore associate Tower Bloodstock, before being acquired by Sheikh Mohammed's Darley Stud.