Amm turned pro in 1961 and quickly had success, winning the Natal Open three years later.

In the mid-1960s, Amm continued to play well, recording a number of second- and third-place finishes on the New Zealand Golf Circuit.

He began his career as an assistant pro at Mowbray Club in Cape Town, South African.

[2] Late in the month, he received some attention for tying for the win with his teammate at the Malayan Open pro-am.

[13] Amm, however, abruptly "cut short" his tour of New Zealand before the season was over to return to South Africa.

Amm finished regulation tied with Cobie Legrange and a sudden death playoff ensued.

In the second round he scored a "fantastic" 64, including two eagles, to break Gary Player's course record.

[19] The following week, at the Forest Products Tournament, Amm again recorded a runner-up finish, one back of Kel Nagle.

In February 1966, at the South African Masters, Amm "led throughout" and won easily, defeating Trevor Wilkes by four strokes.

In January 1967, Amm was in contention at the General Motors Open; he was in joint third at the midway point.

[28] In 2013, his horse Pan Amm won a significant event in Kenilworth, South Africa.