Southern extended its winning streak to six games with a convincing 31-7 win against Kaikorai at Bathgate Park.
The Magpies used width for a change and ran in five very good tries.
Dunedin clawed back a 10 point deficit to beat University 33-22 in the Jonathan Keogh Memorial at the University Oval.
Zingari-Richmond beat Green Island 30-28 in a thriller at Miller Park, while Taieri beat Alhambra-Union 29-22 at the North Ground.