[1] Doug came to prominence in 1972 when he won silver medal in the triples at the 1972 World Outdoor Bowls Championship in Worthing.

Four years later he won the singles, pairs and team gold medals at the 1976 World Outdoor Bowls Championship in Johannesburg.

He won 14 of his 15 matches to win the singles ahead of Bob Middleton of Australia and David Bryant of England.

His international success was cut short by 1980 because South Africa had been excluded from competing by the IBB.

[3] In 1976 he was invited by the Waratah Club of Australia to compete in a bowls competition and the Australian authorities missed the fact that he was competing as a South African national which was not allowed because of their stance against Apartheid in South Africa.