I thought I had posted this but obviously I got distracted and forgot to post.
Extract from Wikipedia:
Shergar's Racing career:
"Bred by his owner Prince Karim Aga Khan IV in County Kildare, Ireland close to the stud from which he was stolen, Shergar began training with Michael Stoute at Newmarket. His debut race in 1981 was the Guardian Classic Trial at Sandown Park. Racing correspondent Richard Baerlein, after watching the colt win by 10 lengths famously advised race-goers that "at 8-1, Shergar for the Derby, now is the time to bet like men."
After winning the Chester Vase by 12 lengths, Shergar started odds-on favourite at Epsom, ridden by 19-year-old jockey Walter Swinburn, also entering his first Derby. Swinburn recalled that early in the race Shergar "found his own pace and lobbed along as the leaders went off at a million miles an hour, with me just putting my hands down on his withers and letting him travel at his own speed". Shergar pulled to the front early and went further clear, so far that John Matthias on the runner-up Glint Of Gold thought he had won: "I told myself I'd achieved my life's ambition. Only then did I discover there was another horse on the horizon."
Shergar's next race was the Irish Derby, ridden by Lester Piggott. The apparent ease with which Shergar passed the rest of the runners, winning by 4 lengths, caused commentator Peter O'Sullevan to exclaim: "He's only in an exercise canter!" The horse became a national hero in Ireland."
It's very interesting that Shergar did not race as a 2yo. I'm sure that race horses are better off if they don't race as 2yos, or maybe just a gentle intro to the race course late in the season when it is absolutely certain that the plates in their knee joints have properly fused. So many champion 2yos just fail to live up to their promise as a 3yo.