He was part of the Australian teams that won the 1954 Commonwealth Tournament at St Andrews and the 1966 Eisenhower Trophy in Mexico City.

[7][8] Later in the tour Berwick finished runner-up in the New Zealand Open at Wanganui, a stroke behind Alex Murray, taking the Bledisloe Cup as the leading amateur.

[10] Berwick won the New South Wales Amateur Championship at Concord in 1953, beating Bruce Crampton 5&4 in the final.

[14][15] In 1954, Berwick was part of the six-man Australian team that played in the inaugural Commonwealth Tournament on the Old Course at St Andrews.

[16][17] The Australian team won the five-team Commonwealth event, with three wins and a tied match against Great Britain.

[23] Berwick was part of the four-man Australian team that won the 1966 Eisenhower Trophy in Mexico City, finishing two strokes ahead of the United States.

His decision followed a change in the Australian PGA rules which meant that some new professionals no longer needed to serve an apprenticeship before receiving prize money.

[30][31] Berwick was appointed Member of the Order of the British Empire (MBE) in the 1977 New Year Honours for service to sport.