Leinster Lightning retained the One Day Inter-Provincial Cup following North West Warriors' last ball one-wicket win over Northern Knights at Waringstown.
A first-wicket partnership of 76 between Chris Dougherty and Nik Smith gave Knights a constructive start.
However the accurate bowling of Andy McBrine and Ross Allen restricted them to a disappointing total of 167.
Allen hit a six off the third delivery of the final over to leave the Warriors needing only three runs for victory.
The final game in the competition between Lightning and Knights at Rathmines on September 10 is now irrelevant in terms of the outcome of the tournament.
Sunday's contest at The Lawn was reduced to 30 overs a side due to rain and ended up going down to the very last ball that the Warriors' 10th wicket pairing of Davy Scanlon and Allen managed to scramble away for the winning single. with Greg Thompson's run out attempt missing by inches.
Ireland skipper William Porterfield made his debut in the North West side but the Warwickshire man was to be out of luck- run out off the fingers of bowler Nathan Smith while backing up, having made just eight.
James Shannon had opted to bat first on winning the toss and openers Dougherty (41) and Nikolai Smith (40) gave their team a superb start with a first wicket stand of 76.
Warriors captain McBrine (3-32) led something of a fightback after that and as the runs dried up it took cameos from Adam Dennison (23) and Greg Thompson (23) to keep the scoreboard ticking over.
Allen and Lazars prevent strong Knights finish
Any thoughts of a big finish were to be undone by Eglinton spinner Allen however as he claimed 3-9 from his two overs while Steve Lazars chipped in with 2-45, the hosts eventually all out for 167 with what was to prove a crucial five balls left unused.
The early loss of David Rankin and the run-outs of both Porterfield and then Stuart Thompson saw the Warriors off the pace early in their reply before David Barr and Johnny Thompson added a valuable 49-run stand for the fourth wicket.
Even after losing opener Barr for 28, Thompson took on all comers, hitting three fours and four sixes in his even-time 51.
McBrine and Thompson put on 25 more before the latter fell to Lee Nelson and then the skipper and his Donemana club-mate Ricky-Lee Dougherty looked to be cruising to victory before a late flurry of wickets left the game on a knife edge.
Crucially, McBrine hit Gary Kidd for consecutive sixes to leave the Warriors back in charge at 159-6 in the 28th over, needing just 9 more to win, but even then they nearly let it slip as Kidd took his revenge to dismiss the visiting captain for 36.
Andy Britton and Lazars both followed in quick succession before Allen hit the third ball of Nikolai Smith's last over for six.
The last pair were able to just do enough to get the Warriors over the line from there as the North West outfit continued their good run of form across the series this season.
Nathan Smith (3-14) and Jacob Mulder (2-30) fared best with the ball for the hosts.
HANLEY ENERGY INTERPROVINCIAL CUP
At The Lawn, Warriors beat Knights by one wicket
KNIGHTS 167 all out (29.1 overs; C Dougherty 41, Nik Smith 40, G Thompson 23, A Dennison 23; R Allen 3-9, A McBrine 3-32, S Lazars 2-45)
WARRIORS 168-9 (30 overs; J Thompson 51, A McBrine 36, D Barr 28; Nat Smith 3-14, J Mulder 2-30)