Photo: ODT
Southern finished strongly to beat Dunedin 41-25 in the top of the table clash at Bathgate Park.
The win means Southern has secured the Speight's Jug and pole position on the competition standings going into round two of the tournament.
Harbour scored a late length of the field try to grab a 20-20 draw against University at the University Oval.
Kaikorai continued its resurgence with a 51-17 win against Green Island at Miller Park, while Alhambra-Union recorded a convincing 51-25 win against Zingari-Richmond at the North Ground.