North County blew The Hills out of the water to end their reign as Senior Cup holders in one of four rain-affected ties.
In a contest reduced to just 20 overs per side, The Hills posted what looked a challenging 146 for 7, with Tomas Rooney-Murphy striking three sixes in his 41 from 37 balls, while there were brief cameos from Mark Donegan (25) and overseas player Daya Singh (22).
Adam Coughlan (2-26) and Sean Kingston (2-39) each picked up a brace.
Jamie Grassi and skipper Niall McGovern got the County reply off to a whirlwind start as they put on 72 in the first six overs before Grassi fell.
He struck 7 boundaries in his 20-ball innings of 37, and with McGovern going on to make 51 from 42 balls (5 fours) the contest was as good as over.
The pair was very severe on Max Sorensen, Naz Shaukat and Sean Terry.
Malcolm Nofal (35*) and Eddie Richardson (10*) ensured the eight-wicket win.
Pembroke progressed to the next round thanks to a narrow two-wicket win over Malahide.
The villagers posted 165-6 thanks primarily to a century stand between Gary Ford (65) and James Newland (53).
Newland took early wickets but Pembroke held their nerve in a tense finale.
YMCA, winners in 2016 are in the hat after an emphatic 90-run (DLS) win over Rush.
Simi Singh was yet again their top scorer, thumping 8 fours and 3 sixes in his 81 from 66 balls.
He added in 88 in 76 balls with Harry Tector (23), while Sam Murphy's unbeaten half century saw YM finish on 239 for 5 in their 31 overs.
Jarred Barnes (3-21) struck twice in the first over of the reply and Rush were never able to gain any momentum - ending on 143 for 8, with Shahid Iqbal top scoring on 34 not out.
Sam Streek (3-22) also among the wickets.
Two sides looking to end long barren runs in the competition met, with Phoenix (last winners in 1982) ousting Leinster (1998 being their last success) by 30 runs (DLS).
New Zealand overseas player Brad Kneebone put his recent knee injury behind him as he hit 68 from 55 balls (8 fours, 1 six).
He shared a third wicket stand of 85 with Rory Anders (34) as Phoenix posted 191 for 9 in 31 overs.
A fourth wicket stand of 86 between Leinster professional Monil Patel (67) and Joe Carroll (35) gave the Rathmines side hope, but with the required rate ever increasing they tailed away to be all out for 164.
Reinhardt Strydom picked up 3 for 41, while there were a brace apiece for Ali Karvelas, Tom Anders and Fletcher Coutts.
The Balbriggan v Merrion tie fell victim to the elements and will be refixed.