In the test, he and Smith, who posted the best quality points, beat the Welsh team of Gareth Daniel and Richard Jones by 1.7 points, while Fagan finished the Open final with a 0.65pts winning margin over runner-up Jones.
The test win meant the Kiwis avoided a Welsh whitewash, being beaten 3-1 in a series which started at Cothi last weekend. With a loss to Scotland, two wins over England and a victory over Ulster it gave New Zealand a 4-4 result for the eight-test tour.
In another Kiwi triumph at Corwen, Fagan's son, first-season Open-class shearer Jack, teamed with fellow King Country shearer Mark Grainger and Smith's brother, Matthew, to beat teams from Wales, Ireland and France in an international relay
Fagan first represented New Zealand in a shearing test against a world team at the Golden Shears in Masterton in March 1985.Fagan last shore a test in his home town of Te Kuiti in 2011, as New Zealand completed an unbeaten series against Wales.
Fagan is expected to start a 33rd New Zealand open-class season in October, with perhaps a dream of a place in the New Zealand team at next year's world championships in Ireland.