The All Black winger scored three tries in Harbour's 66-24 romp against Zingari-Richmond.
Gareth Evans' no-look pass put Leroy van Dam into a gap and his try was the turning point in Dunedin's 32-23 win against Southern.
The win helped Dunedin consolidate fourth place, while the Magpies are now nine points adrift of the top four.
Pirates was in danger of being forced to default midweek but fronted for its fixture against Taieri.
It was well beaten 68-19 but crossed the chalk three times and managed to contest the scrums for 55 minutes despite a critical shortage of props.
University A was understrength but still managed a comfortable 44-24 win against Green Island.
Speedy winger Gavin Stark nabbed three tries.
Kaikorai escaped with a 27-25 win against the winless Alhambra-Union.
Dunedin 32
Southern 23
Southern started the game with a stiff breeze at its back and dominated the first 20 minutes in pursuit of defending its beloved Ron Reggett trophy.
Southern dominated territory and possession and made good use of the breezeand was rewarded for its endeavour when flanker Adam Knight brushed off some weak tackles and unloaded to winger Piliu Tavake, who scampered away to dot down under the bar.
Throw in a penalty to Jono Hayes and Southern led by 10.
Dunedin finally awoke on the back of some Gareth Evans (No8) and Leroy Van Dam (centre) breaks, quickly scoring two tries to midfielder Fapene Popoaili'i and flanker Morgan Reedy.
Both were converted by fly half Louis Tili to give Dunedin a surprising lead with 10 to go to the break.
Southern was not done and bounced back with a try to five-eighth Josh Ioane under the black dot from broken play, followed by a handy penalty to fullback Jono Hayes to retake the lead by six.
Right on halftime Adam Knight was cruelly denied a try to a dubious double movement call that would have given it a healthy lead.
Dunedin came out firing in the second spell.
Tili kicked an early penalty and Dunedin was camping in Southern territory.
Gareth Evans put Leroy Van Dam away out wide with some breathtaking skill and he beat two tacklers to cross out wide for an unconverted try to put Dunedin up by two.
Hayes put Southern back in front against the run of play with a penalty.
However, Dunedin was not to be denied and Tili went on a point-scoring spree of his own when he crashed over close to the posts when Dunedin had numbers with fast hands.
He kicked the conversion and a 40m penalty soon after to put the game and the trophy out of Southern's hands.
For Dunedin, Van Dam, Evans and Tili were standouts.
Winger Henry Scott always looked dangerous and Hame Toma and Mark Grieve Dunn were their normal industrious selves up front.
For Southern, Adam Knight was its best and No8 Mika Mafi was strong with ball in hand. Josh Ioane and Jono Hayes were Southern's two best attacking weapons.
Taieri 68
Pirates 19
It must have come as a great relief to Pirates that Taieri opted to leave Otago prop Aki Seiuli on the bench until 10 minutes into the second half.
And the sight of midfield back Kori Rupene packing down on the blindside was another indication the Eels had made some sporting selections for the fixture at Peter Johnstone Park.
But then, Pirates did well just to front.
It appeared as if it might have to default the game earlier in the week due to a critical player shortage.
But it managed to stitch a team together and actually played some reasonable rugby.
Yes, it was thumped 68-19.
But given the ordeal the team had in the lead-up, it was not a terrible performance.
Centre Sam Shearer was dangerous on attack and nabbed two intercepts - one of them netted him a try.
He missed his share of tackles but so did the rest of his team-mates.
Lock Chris Morrissey made a telling run that set up another try, and flanker Hayden Fleury gave it his all.
Taieri was too good, of course, and kept running in tries - 10 of them. Fullback Mitchell Scott carved through gaps with ease.
The second of his two tries was a solo effort that started on the halfway and left three or four tacklers in his wake.
Taieri also defended well during the second spell to deny Pirates a four-try bonus point.
University A 44
Green Island 24
University A was missing a few players, including the two towers Jack Sherratt and Josh Dickson.
But the students did have Gavin Stark on the right wing and he used his speed and that fend of his to score three tries during a comfortable win against Green Island at the University Oval.
On the other wing Sam McLachlan had a cracking game as well, scoring two tries.
But while University was too slick out wide in a free-flowing game, Green Island dominated the forward exchanges and particularly the scrum.
Highlanders prop Ross Geldenhuys is a beast at club level and the Green Island pack pushed University off the ball two or three times.
The visitors were awarded a penalty try early in the second spell and you can put that down to a big shunt from Geldenhuys. Green Island might have been better served keeping the ball in close.
Its backs were guilty of making far too many mistakes and University swooped on just about every opportunity.
First five-eighth Fletcher found space behind his back-peddling pack and landed four conversions and two penalties.
For Green Island, hooker Ricky Hollamby produced another good performance, while loose forwards Jackson Hemopo and Makoto Tosa both impressed.
Harbour 66
Zingari-Richmond 24
Dynamic flanker Ben Whale played a key role in Harbour's 10-try 66-24 win against Zingari-Richmond in the annual Bandy Scoles Memorial match at Montecillo.
Whale won his share of lineout ball, tackled ferociously and made powerful runs up the centre with the ball.
Centre Aleki Morris added a second-half try to keep up his record of scoring in all six games this winter.
All Black Waisake Naholo demonstrated his strength and speed by scoring a hat-trick of tries and fullback Logan Allen and first five-eighth Sam Porter looked classy with the ball in hand.
Allen and Porter each kicked four conversions in the tricky wind conditions.
Harbour ran the ball from all parts of the paddock and scored four first-half tries to lead 26-7 at the break.
It put its foot on the accelerator and added six more tries and 40 points in the entertaining second spell.
Zingari was beaten but not disgraced and the backline attacked from wide out and looked dangerous with some crisp passing.
Centre Dwayne Corcoran was difficult to stop inside the 22m and scored a hat-trick of tries.
Chris McNoe was solid at fullback and his long pass to winger Allister Butterfield led to Zingari's first try.
Thomas Johnson was accurate at first five-eighth and No8 Chris Bell was the workhorse in the pack.
Kaikorai 27
Alhambra-Union 25
Kaikorai clawed its way back after Alhambra-Union scored at a point-a-minute rate in the first quarter in the Murphy Memorial match at the North Ground.
Alhambra-Union began the match playing vintage 15-man rugby and the points flowed, but it became starved of ball in the second quarter as Kaikorai dominated territory and possession to run in three tries and take a 21-20 lead into the break.
Despite a possession and territorial advantage throughout the second half, Alhambra-Union's handling and lineout errors proved its undoing.
Although regaining the lead early, its backline flair that appeared a game-breaker in the opening minutes deserted it as it opted to keep the ball in close quarters, with Kaikorai's defence proving equal to the task.
Its rare sojourns inside the Alhambra-Union half proved the match-winner as it netted two penalty goals through the boot of Matt Jones.
Jones proved solid as a last line of defence at fullback.
He complemented some great work in midfield by Danny van der Voort and Jayden Spence, and missed only one of his six attempts at goal.
In close, Kaikorai was well served by Slade MacDowell, Lachie Landels and Willie Miller.
Props Bevan Bolger and Tristan Fuli worked tirelessly all game for Alhambra-Union, while Adam Simpson and Cama Poasa featured in the backs.
