Mutch, who had been top qualifier from the heats and the semifinals, had to settle for third.
The holder of a world record of 744 lambs in an eight-hour day, shorn in NZ where he works for about four months each year, Scott, from Kilmacrennan, Co Donegal, is yet to reach a world championships final but now becomes a serious threat to the hopes of Mutch, Smith and Kirkpatrick.
Scott, 33, also partnered Robinson in an All-Ireland team which was beaten only by the New Zealanders in a five-nations contest of 10 sheep for each shearer, identical to the conditions of a teams championship which will be one of six world individual and teams machine shearing, blades shearing and woolhandling titles to be decided next Sunday.
Meanwhile, Galway's Tom Kennedy, 47, will join Scott in the Ireland team in Gorey, Co Wexford, after winning the second Irish position in a week-long selection series which ended yesterday. It will be Kennedy's fifth world championships.
A major festival has started in Gorey ahead of the world champs opening tomorrow, when more than 350 shearers and woolhandlers will compete in all-nations events, including 102 competitors from 27 countries, over the following days.