[2] Serjeant was the second of three foals produced by the mare Aspasia,[3] making him a brother to Dungannon, who won nineteen races and finished second to Saltram in the 1783 Derby.
He started 1/3 favourite a 200 guinea Sweepstakes over ten furlongs and won beating Lord Clermont's colt Cantator.
Ridden by John Arnull he won from the 20/1 outsider Carlo Khan, with Lord Derby's colt Dancer finishing third.
[7] Racing over the same course and distance he won the Sion Stakes, carrying six pounds more than his three opponents who included Dancer and Carlo Khan.
[7] At the First Spring Meeting in 1786, Serjeant was beaten by Mr Dowson's horse Clayhall in a 200 guinea match race over the Beacon Course.
[13] Ten days later he appeared at Stockbridge Racecourse where he finished last of the three runners over four miles behind Sir John Lade's horse Punch and Mr Watts' mare Miss Kingland.
[14] At Newmarket's Second October meeting, Serjeant was matched against Mr Fox's five-year-old horse Balloon over the Beacon Course.