He was also chosen as a first violinist by the National Youth Orchestra of Wales in 1955. After doing his national service in the RAF, he established himself in first-class cricket in 1960, when in his first year at Christ's College, he scored 1307 runs for Cambridge University at 43. 56, followed by 616 runs at 30. 80 when he played for Glamorgan later in the season. He captained Cambridge in his final season there in 1962, when in all matches he made 2188 runs at 40. 51, with five centuries. He played all of his county cricket as an amateur until that status was abolished at the start of the 1963 season. He also topped 2000 runs in 1966, when he made 2190 runs, more than anybody else in the season, at 40. 51, including his only double-century, 223 against Kent at Gravesend after Glamorgan had followed on. He captained Glamorgan from 1967 to 1972, taking the county to its second championship in 1969, when Glamorgan went through the season undefeated. Until the abolition of amateur status in 1963, when all players became known simply as 'Cricketers', Lewis played his county cricket as an amateur, representing the Gentlemen in the [[Gentlemen v Players series of matches.