1972: two-year-old season Thatch began his career with three easy wins at the
Curragh, starting with the Corrib Maiden Stakes over six
furlongs in June. In the following month he was moved up in class and won the Group Three
Tyros Stakes over the same course and distance followed by a success over seven furlongs in the Probationers Stakes. In August he was sent to France to contest the Group One
Prix Morny but finished fourth behind Filiberto. He reportedly did not cope well with the journey from Ireland and was not suited by the soft ground. Although he did not race again in 1972, he was officially rated the best horse in Ireland by a margin of six
pounds.
1973: three-year-old season On his three-year-old debut, Thatch won the Group Three Vauxhall Trial Stakes over seven
furlongs at
Phoenix Park Racecourse. On 5 May the colt was sent to England for the first to contest the
2000 Guineas over the Rowley Mile course at
Newmarket Racecourse. Ridden by
Lester Piggott, he was strongly fancied for the
classic, with his main opposition expected to come from the French-trained colt Targowice. outsider
Mon Fils, with O'Brien blaming his colt's defeat on the rain-softened ground. from his only opponent, Owen Dudley, a colt who had previously won the
Dante Stakes at
York and the
Diomed Stakes at
Epsom. In the following month he was moved down in distance to contest the July Cup against specialist sprinters over six furlongs at Newmarket's July course. Ridden as usual by Piggott, he started 4/5 favourite At the end of the month Thatch returned to the mile for the Sussex Stakes at
Goodwood Racecourse, which at that time was restricted to three' and four-year-olds. He won by three lengths from
Jacinth, a filly who had been rated the best British two-year-old of either sex in 1972. Later in the season, Thatch was withdrawn from engagements in both the
Queen Elizabeth II Stakes and the
Prix du Moulin, as his connections did not wish to run the colt on soft ground. At the end of the season he was syndicated at a valuation of £1m and retired to stud. ==Assessment==