Sunshack was a dark bay horse with a small white star bred in England by his owner Khalid Abdullah's Juddmonte Farms.
Sunshack made a successful debut in the Prix de Fontenoy over 1600 metres at Longchamp Racecourse on 5 September 1993, beating Goldmine by a short head.
Racehorses in France are coupled for betting purposes and Sunshack was part of a two-horse Khalid Abdullah entry alongside the Prix Saint-Roman winner Zindari.
Ridden by Eddery he started the 1.7/1 favourite ahead of the German champion Monsun in a field which also included Red Bishop (later to win the Hong Kong Vase) and Rainbow Dancer.
He was held up at the rear of the six-runner field and although he made some progress in the straight he looked outpaced by his main rivals and finished fourth behind Tot Ou Tard.
With Jarnet in the saddle he turned into the straight in third place but looked to be outpaced once again before staying on in the closing stages, overtaking the leader Sand Reef 100 metres from the finish and winning by three quarters of a length.
[8] A year after his first, unsuccessful, visit to Epsom Racecourse, Sunshack returned to the English track for the Coronation Cup over one and a half miles on 10 June when he was part of a very strong French challenge.
He began to make steady progress, overtook the leader Time Star approaching the final furlong and held off the sustained challenge of Only Royale to win by a head.
Ridden by Jarnet, he raced in fifth place as Shrewd Idea set the pace before making progress in the straight and taking the lead 300 metres from the finish.