1847: two-year-old season Surplice began his racing career in July 1847 at
Goodwood when he ran in the Ham Stakes. He was made the
4/7 favourite and the result was never in doubt as he led from the start and won easily by two
lengths from Liston. Immediately after the race the
bookmakers offered odds of only 10/1 against him for the following year's Epsom Derby. He followed up in the Produce Stakes at the same meeting, starting at odds of 1/3 and winning by three lengths in a race which was described as "all one way". In September he was sent to
Doncaster, where he won the Municipal Stakes. At
Newmarket in October, he was allowed a
walkover in the Buckenham Stakes, when no horse appeared to oppose him. His earnings of £5,550 were the highest for any British two-year-old that season and his performances were sufficient to send him into the winter break regarded as the leading contender for the following year's Derby.
1848: three-year-old season Surplice maintained his position as Derby favourite in early 1848, despite a series of negative rumours which seemed to originate from Lord Clifden's racing manager, Francis Villiers who had a strong financial interest in his stable companion, Loadstone. After the race
Benjamin Disraeli was attempting to console Lord George Bentinck who was downhearted at having sold the horse who had won the Derby. When Bentinck told Disraeli that a man not involved in racing could not possibly understand the significance of the race Disraeli replied that he knew perfectly well that the Derby was "the Blue Ribbon of the Turf". At Goodwood in July, Surplice ran twice but appeared to be completely unsuited by the soft ground and was beaten in both his races. On the Tuesday of the meeting he finished second to Distaffina in the Gratwicke Stakes over one and a half miles and two days later he finished third to Glendower in the one mile Racing Stakes. Surplice had been odds-on favourite for both races. He was then transferred to the stable of Robert Stephenson. 's
Canezou (winner of the One Thaousand) beaten by Surplice (winner of the Derby), after an exciting race.'' At Doncaster in September he started at odds 9/4 in a nine-runner field for the St Leger, with the
filly Canezou starting favourite. The race was delayed by a badly managed false start, which resulted in most of the runners racing for almost a furlong before being successfully recalled. Ridden by
Nat Flatman, a late replacement for
Jem Robinson, Surplice raced prominently and moved up to challenge the leader Flatcatcher early in the straight. He briefly took the lead, only to be headed by Canezou, but Flatman rode a strong finish and Surplice regained the lead in the closing stages to win by a neck. The finish was described as being a "most exciting" one, although it was noted that, as at Epsom, Surplice was given an extremely hard race, with Flatman making liberal use of his whip and spurs, and after the race he was reported to be in a "distressed" condition. He was the first Derby winner to take the St Leger since
Champion in 1800. Two days after his win in the St Leger, Surplice walked over in the North of England Stakes. On 26 September, Surplice appeared at Newmarket and won the ten furlong Grand Duke Michael Stakes from Flatcatcher. As a result of his strong autumn form, Surplice was made 3/1 favourite for the
Cesarewitch Handicap two weeks later, despite the unfavourably soft ground, but finished unplaced behind The Cur.
1849: four-year-old season Surplice's first run as a four-year-old was intended to be a match race at Newmarket in April in which he was scheduled to concede 35
pounds to
Lord Exeter's filly Tophana, but he failed to appear and his owner paid a forfeit. His first actual appearance was delayed until 3 August when he finished sixth when 6/4 favourite for the Chesterfield Cup at Goodwood. In autumn there were reports of a "great match race" to be run between Surplice, Van Tromp and Justice for Ireland at Newmarket in October. The "match" never came to fruition, as Surplice's two rivals were withdrawn and he walked over for the £1,000 prize. Later that month he failed to appear for a match race at Newmarket in which he was set to receive sixteen pounds from the six-year-old
Royal Hunt Cup winner Collingwood. ==Stud career==