[1] In 2010, he won the Carrus Tauranga Open on the Charles Tour, ahead of Michael Hendry in second and Ryan Fox in third.

[3][4] Campbell represented his country twice in the Eisenhower Trophy, the World Amateur Team Championship, finishing fourth individually in 2010 behind future European Tour players Joachim B. Hansen, Alexander Levy and Romain Wattel.

[6] Campbell turned professional in late 2012 and started playing on the PGA Tour of Australasia.

In 2014, he finished 4th at the WA PGA Championship, two strokes behind winner Ryan Lynch, having led the tournament after an opening round of 65.

In his rookie season, he was runner-up at the AB Bank Bangladesh Open, 3 strokes behind Malcolm Kokocinski.