Davies (23) displayed authority with his long and accurate punting and added seven points with his goal-kicking.
He plays for Plymouth Albion in the second tier of English rugby and is on his second visit to New Zealand.
He scored 115 first-class points when he played for North Otago in 2006.
A last-minute penalty goal by first five-eighth Glenn Dickson gave Pirates an 11-8 win over Taieri and kept Pirates in second place in the Gallaway Trophy competition.
Alhambra-Union edged Dunedin 19-17 to move into third spot, while University A scored six tries to beat Zingari-Richmond 38-3, getting a bonus point to stretch its lead to 10 points.
The leading scorers are: Chris Noakes (University A) 92, Luke Reihana (Alhambra-Union) 74, Hayden Parker (Taieri) 49, Craig Sneddon (Harbour) 47, Cam Rutherford (Kaikorai) 39, Glenn Dickson (Pirates) 37, Lewis Hancock (Southern) 36.
The points after seven rounds are: University A 32, Pirates 22, Alhambra-Union 21, Dunedin 18, Taieri 17, Southern 17, Kaikorai 17, Harbour 15, Green Island 7, Zingari-Richmond 0.
Green Island 17 Southern 17
Green Island applied pressure from the start and gave the more fancied Southern a fright with a draw at Miller Park.
Green Island displayed its mettle from the start when rampaging No 8 Nasi Manu burst from a scrum to give a warning to the defence.
Manu was able to break the advantage line at will to keep the initiative with Green Island.
Another telling point came when new first five-eighth Alex Davies kicked a long-range penalty goal and narrowly missed another one from halfway three minutes later.
Davies had a decisive influence on the game with his ability to read the game, and his quick decision-making.
His long punting gained hunks of territory.
Green Island was prepared to attack from all parts of the ground and extended its lead to 10-0 midway through the spell when hooker Frankie Elisara was up in support to score after a break that started at halfway.
Green Island led 10-0 at the break and then 17-7 after 13 minutes in the second spell when wing Mika Mafi scored after a sustained forward pressure that extended to six phases.
Winger Seb Hill scored both of Southern's tries in the second half.
The Magpies' revival started with experienced prop Kees Meeuws, who kept the ball tight in the forwards and made ground with the pick and go.
Southern dominated the set pieces, with its strong scrum and a dominant line-out.
But mistakes in the backline, pressure and strong tackling from Green Island spoiled Southern's attacking chances.
Flanker Josh Beer and centre Chris O'Neil were strong tacklers.
Green Island 17 (Mika Mafi, Frankie Elisara tries; Alex Davies 2 conversions, penalty goal), Southern 17 (Seb Hill 2 tries; Lewis Hancock 2 conversions, penalty goal).
Halftime: Green Island 10-0.
Referee: Ben O'Keeffe.
Kaikorai 33 Harbour 13
Kaikorai kept its composure and gave a solid display to beat an ill-disciplined Harbour team at Bishopscourt.
Experienced fullback Matt Direen made the break for a try by winger Dan Hyndman to give Kaikorai a 10-0 lead after just 11 minutes.
But Harbour came back into the game in the last 15 minutes of the first half and a brilliant solo try by centre Siaosi Folau reduced the lead to 10-7 at the break.
Kaikorai tightened its stranglehold on the game in the second spell and took complete control to score three tries.
Direen read the game accurately and was a strong defender.
He was also dangerous on the counter-attack.
Centre Danny van der Voort was able to break through the midfield and halfback Tomasi Palu chose his options effectively.
The Kaikorai pack played as a unit and was powerful on the drive and with the pick and go.
Lock Noa Soqeta was a powerhouse in the pack, Seko Kalou was dominant in the line-out and Kensak Palepoi was dangerous with the ball in hand.
Harbour was disjointed and had no pattern to its play.
It showed ill-discipline and this was highlighted when winger Iloa Lihau was given a yellow card late in the game.
Kaikorai 33 (Dan Hyndman, Tomasi Palu, Mitchell Clarke, Jim Stevenson tries; Danny van der Voort 2 conversions, 3 penalty goals), Harbour 13 (Siaosi Folau try; Craig Sneddon conversion, 2 penalty goals).
Halftime: Kaikorai 10-7.
Referee: Tim Baker.
University A 38 Zingari-Richmond 3
University A learned a valuable lesson when it beat Zingari-Richmond at Montecillo: it cannot afford to take any game lightly.
The students had an ordinary first half when they led only 14-3 at the break.
But they displayed more composure during the second spell and returned to their menacing best.
The forwards excelled, with ground work by the tight five complemented by the loose trio of Brad Cameron, Hoani Matenga and Paul Grant.
When Grant was subbed midway through the spell, Alby Herron filled the role admirably.
Winger David Thompson was skilled with his short kick-and-gather that led to his second try.
Both halfbacks had some superb touches.
University's Henry McLernon combined well with first five-eighth Tom Halse and was dangerous on the break, and Ben Defarias impressed behind a beaten Zingari pack.
His combination with No 8 Chris Bell kept Zingari competitive.
Zingari hooker Sammi Charad was workmanlike at the breakdown.
University A 38 (David Thompson 2, Tom Halse, Hoanai Matenga, Sam Hall 2 tries; Halse 4 conversions), Zingari-Richmond 3 (Ben Bradley penalty goal).
Halftime: University 14-3.
Referee: Jeff Grubb.
Alhambra-Union 19 Dunedin 17
The accurate goal-kicking of Luke Reihana helped Alhambra-Union beat Dunedin in a tight game at Kettle Park.
He kicked five goals to score 14 of his side's points in a game that was in the balance until the final whistle.
Alhambra-Union's 9-7 lead at the break was against the run of play because Dunedin held all the territory and its strong front row of David Smart, Will Henry and Kelsey Miller got the better of Alhambra-Union.
But Dunedin missed goal-kicking opportunities and did not play to its strong midfield of Michael Walding and Simon Davey.
Dunedin's first-half try came from a lucky bounce from a kick by halfback Robbie Smith that bounced into the hands of fullback Louis Tili, who passed to flanker Sam Green for the try.
Dunedin players ran into the collision area where they met a formidable resistance in Alhambra-Union loose forwards Matt Kissick and Wahari Waitohi.
Alhambra-Union had its best quarter after the break when it extended the lead to 19-10.
Lock Scott Stevens won good line-out ball and hooker Ben Pereira was having a tigerish game in the tight-loose.
Dunedin came back into the game when No 8 Joe Dobson scored, but it ran out of time to chase the win.
Alhambra-Union 19 (Ben Pereira try; Luke Reihana conversion, 4 penalty goals), Dunedin 17 (Joe Dobson, Sam Green tries; Louis Tili conversion, Shaan Davis conversion, penalty goal).
Halftime: Alhambra-Union 9-7.
Referee: Ross Barnett.
Pirates 11 Taieri 8
Pirates first five-eighth Glenn Dickson slotted a last-minute penalty to help his side seal a dramatic win against Taieri.
Both kickers had opportunities to win the match in the dying moments but struggled to find the middle of the posts despite pleasant conditions at Hancock Park.
Dickson had three penalty shots in the final 10min and Taieri first five-eighth Hayden Parker missed a penalty and a poorly executed dropped goal which could have swung the game Taieri's way.
In a classic game of two halves, Taieri dominated the first spell.
Captain Charlie O'Connell was at his explosive best from the base of the scrum and a superb double-round by fullback Mike Kerr put winger Tom Davie in the clear.
Davie used his pace to beat the cover defence and dotted down in the corner.
Parker kicked a penalty to give Taieri an 8-0 lead midway through the half.
Having defended for most of the match, Dickson then landed a penalty for Pirates right on halftime to narrow the gap.
The second half ushered a change in fortune with the home side seizing the momentum through some powerful scrummaging.
Taieri held on with some spirited defence but, with the penalty count mounting, Canterbury referee Kirk Rae reached for the yellow card.
Hooker Henry Parker trudged off and, with Taieri reduced to 14 men, Pirates was finally able to breach the defence.
It took a superb effort by centre Marshall Suckling, who slipped through a tackle and crashed over in the corner, to level the scores.
Pirates 11 (Marshall Suckling try, Glenn Dickson 2 penalty goals), Taieri 8 (Tom Davie try, Hayden Parker penalty goal).
Halftime: Taieri 8-3.
Referee Kirk Rae.
