Lambert was born in 1779 at Burstow on the Surrey-Sussex border and learned his cricket on village pitches in the closing years of the eighteenth century. By 1801 he had attracted the attention of the patrons who ran Surrey cricket and was given his chance in the season's most important fixture, Surrey v England at Lord's Old Ground. Surrey were dismissed for 109 in their first innings and 169 in their second; England, captained by the Duke of Hamilton's nominee, won comfortably. Lambert went in at number ten and contributed 0 and 5, the kind of unobtrusive debut that gave no warning of what was to come. The bat he used was the curved blade of the underarm era, no more than four inches at its widest. The pitch was a rough strip on the Dorset Fields ground that Thomas Lord had opened in 1787; bowlers were given enormous help and a score of 169 in the second innings was respectable. Lambert returned to club cricket and played intermittently in major matches for the next four seasons before establishing himself as a regular by 1806, the year he was drafted as a given man for the Gentlemen in the inaugural Gentlemen vs Players match.