Taieri scored three tries in beating Alhambra-Union at Peter Johnstone Park, but it will need to brush up its play to beat University A in the semifinal.
Dunedin hung on desperately in the final minutes to beat Alhambra-Union at Kettle Park.
A late try by reserve hooker Johnny Mason gave Southern a narrow win over Alhambra-Union at the North Ground.
Lively hooker Masiu Akavola scored two second-half tries and played a key role in Zingari-Richmond's last-gasp 20-19 win over Alhambra-Union at Montecillo.
The lightning pace of fullback Tony Ensor outwitted the Alhambra-Union defence and gave Kaikorai an early lead that it held for the rest of the game.
Hooker Ben Pereira had his radar tuned in, followed the ball and scored three tries for Alhambra-Union at Miller Park.
Powerful centre Wayne Gibson used his strength to score a hat trick of tries when Harbour beat Alhambra-Union at Watson Park.
Prop Scott Manson had a storming game as Alhambra-Union y broke down University A's resistance to gain a bonus-point win at the North Ground.
Peter Breen deserved to kick the winning penalty because he was the best player on the paddock when Alhambra-Union beat Dunedin at the North Ground.
Fullback Tony Ensor scored a spectacular runaway try nine minutes from the end to clinch a deserved win for Kaikorai over previously unbeaten Alhambra-Union at Bishopscourt.
Alhambra-Union overcame a sluggish first half to score a comfortable 27-17 win over a tenacious Green Island at the North Ground.
Southern took complete control in the second spell when it scored 27 unanswered points to beat Alhambra-Union at Bathgate Park.
Harbour played more effective wet weather rugby in the second spell to beat Alhambra-Union at the North Ground.
Liam Edwards was the inspiration for an enterprising Dunedin team that scored six tries and retained the Centennial Trophy against Alhambra-Union at Kettle Park.
The last 10 minutes of the first half decided the game when Kaikorai squeaked home 25-23 against Alhambra-Union at the North Ground.
No 8 Daniel Crichton was difficult to stop and played a key role in Pirates' 27-11 win over Alhambra-Union at Hancock Park.
Peter Breen played a leading role when Alhambra-Union scored seven tries to beat Zingari-Richmond 43-3 at Montecillo.
Tom Halse kicked a penalty in injury time to give University A a nail-biting win over Alhambra-Union at the North Ground.
Green Island took on Alhambra-Union at Miller Park on Saturday, and scored two tries in the last three minutes to win by a single point.
Green Island performed the Houdini act at Miller Park, scoring two tries in the last three minutes to beat Alhambra-Union by a point.