Alhambra-Union clinched a dramatic 30-28 win against University at the University of Otago Oval this afternoon.
Lock Levi Turoa scored twice in the last five minutes to help seal the upset.
Dunedin edged Harbour 37-35 at Kettle Park in another topsy-turvy game.
Kaikorai retained its unbeaten record with a 27-19 win against Green Island at Bishopscourt, and Southern eased to a 50-17 win against Zingari-Richmond at Bathgate Park.
The scores
Kaikorai 27-19 Green Is full-time
University 28-30 Alhambra Union full-time
Southern 50-17 Zingari full-time
Dunedin 37-35 Harbour full-time
Taieri - bye