During his time with the All Blacks from 1985 to 1993, he wore the number 10 jersey (first five-eighth or fly-half), and was the main goalkicker for the All Blacks. He amassed 645 points from 46 All Black Test Matches (1 try, 118 conversions, 128 penalties, 7 drop goals). He is considered a true pioneer of the modern art of goal kicking, in particular the technicalities of leaning the ball forward, which has been adopted by world class kickers since; many believe he is one of the greatest first five eights in All Black history. Even though he was not a great runner with the ball in hand. Despite his relatively short height, he made-up for this with fantastic distribution skills reinforced by his long-term colleague John Kirwan's then-world-record career statistics playing outside him for Auckland and the All Blacks. His inability to score tries was often a joking point in the team – his cause not helped by an overruled attempt against Ireland in 1989 (due to a prior technical infringement by a teammate).
The highlight of Fox's career was winning the inaugural Rugby World Cup with New Zealand in 1987; a victory based in part on his accurate kicking.