Like Hastings Golf Club member Duff, Bob Shirley, of Carrington, also made his first appearance at the event to register two victories from his three matches.
Brent Paterson, of Royal Auckland Golf Club, and John Batley, of Titirangi, mustered three of the last four points on offer between them to help the hosts lift the trophy.
The first point of the day came from Stu Nicholls, of Waitemata, who played in his second Sanctuary Cove Trophy, against one of the leading Australians, Geoff Cranfield, to stop the early rot.
On reflection, the day one team points proved pivotal in allowing the New Zealanders to build a small buffer entering the all-important final day.
In the singles competition on Tuesday, Duff had the measure of Kym Olsen in posting 3 and 2 victory.
Hastings PGA professional Brian Doyle coaches Duff, a Lindisfarne College schoolteacher, who also is a former Central Districts Stags cricketer.