"Just wait until the rub of the green goes our way," he said.
Wanganui finished fifth overall at last year's tournament in Christchurch and Spence said the aim was to at least finish in the top four this time, although the boys had higher aspirations for themselves in Hamilton.
Yesterday winger Chris Ferguson opened the scoring for Wanganui in the 11th minute and 18 minutes later centre half Ryan Gray added another to make it 2-0 at halftime.
Just a minute into the second spell, centre forward Remi Halpin scored the first of his two goals, adding the other three minutes later.
Right winger Jordan Cohen and inside left Cole Brasting also scored, to Manawatu's embarrassment.
Spence said the boys were eagerly awaiting the match against Marlborough this morning and the chance to advance in the competition.