Tyler Nichol-Hilton got a hat-trick before halftime with Wanganui leading 4-0.
The other goals came from Kian Belk, Patrick Madder and the Cohen brothers - Jordan and Ethan.
For the girls, the play was impossibly tight when tied with Manawatu 1-1 at the end of regulation time.
Entering sudden death, both teams dropped off their goalies and then other players periodically.
"In the second five minutes, they got a penalty corner and we've got no goalie on - but we saved it," said Dixon.
After starting with nine each and eventually reduced to five, Wanganui got the game winner through Kate Tylee.
Rebecca Baker, Imogen Burrows, Claudia Ryan and Kate Belsham also played well.
Today, the boys team meet Auckland in their semi, while the girls play North Harbour B.