McGuinness won the toss, chose to bat and put on 39 with Nathaniel Fearnley.
McGuinness made 11 and Fearnley 20.
Jonah Reynolds (8) and hard-hitting Zyden Worsnop (15) later put on 31 for the eighth wicket.
Those two partnerships were crucial in the visitors’ total of 130, as were extras.
Both teams used seven bowlers and every bowler conceded wides — 36 of the 54 extras Lakelands coughed up were wides; 23 of Poverty Bay’s 29 extras were wides.
McIntyre (3-16 from 5.5 overs) and off-spinner Bayden Turuta (3-26 in eight overs) were Lakelands’ most successful bowlers.
The dry, two-paced and unpredictable pitch tested all batsmen.
An example of this came from Fearnley’s new-ball partner, left-armer Caleb Taewa (3-28 off six overs with one maiden), who bowled Lakelands No.9 Aiden Hogg (7) with a wicked ground-grubber.
Outstanding prospect Patrick McInnes caught Lakelands left-hander Paul Michael at mid-wicket on the pull for a second-ball duck off Taewa to claim the first scalp in the second innings.
Taewa then bowled Hamish Crafar (1) with the first ball of the fourth over to have Lakelands 2-5.
Enter brutal hitter Connor Banks.
The squat, powerful Banks got off the mark with a cover drive for two and almost decapitated Taewa with a sizzling straight drive for four.
He pulled the fifth ball of the over for four and signed off with a leg glance for three fours in a row.
Three balls later, Fearnley (3-26 off 6.5) trapped him leg before wicket and the hosts were 17-3.
Poverty Bay’s spin attack bowled well after the first drinks break at the 15-over mark.
Left-arm orthodox spinners Riker Rolls (1-25 off eight overs) and Charlie Whitfield (1-5 from three overs) each bowled a maiden, while off-spinner Ted Gillies took 1-14 in three overs.
Gillies got the king wicket of captain and first-drop Logan Hutchings (26), a skilful accumulator who also struck two boundaries in his 47-ball knock.
His stand of 46 with sixth man in Jesse Russ (12) got Lakelands to 70-5 and they were in a fair position at that stage.
That changed when Gillies caught Russ at deep backward square leg off Rolls, then bowled Hutchings.
Like his skipper, Gillies broke his right thumb before Christmas but fields fearlessly and competently.
Promising outswing bowler Tarn Boyle (2-10 off three overs) made a sensational start to his spell. He held a return catch to dismiss Taylor Smith (12) with his first ball in a wicket maiden.
Lakelands, under the pump, lost their eighth and ninth wickets with the score at 104.
Death-overs bowler Fearnley, breathing fire, took the last — Turuta for 15 — with one ball remaining in the 35th over, courtesy of a brilliant catch by gloveman McGuinness, who leapt to his right and caught the ball one-handed behind himself.
“Winning the toss and batting first was key on that wicket,” McGuinness said. “We rotated strike and Nathaniel scored valuable runs for us.
“Our bowlers stuck to the plan, which was to bowl full at the stumps and our spinners bowled well under pressure.
“Riker was very consistent, Charlie put doubt in the minds of the batsmen by turning the ball and Ted’s ability to vary his pace had them playing back to full stuff. Natty (Fearnley) bowled great lines.
“Jack Roberts (12 years old) was our youngest and he more than held his own in the field. He’ll be a great player.”
Reynolds was unlucky. His figures of 0-12 off four overs could have featured two wickets but for dropped catches.
“Our team spirit was excellent,” McGuinness said. “
And much of our success on Sunday was down to Joey Turner (Poverty Bay) and Northern Districts pathways and talent coach Keegan Russell, who have helped all of us to develop our skills this season.”