When Ross Adair was signed for CIYMS during the close season, it was in the hope that he would add firepower to an already formidable side.
After his demolition job on league leaders CIYMS, Ross did exactly what it said on the tin.
Neil Brand's unbeaten 110 would have given the Comber side genuine hope after setting a tough 243 target.
However Adair dominated an opening stand of 129 with Chris Dougherty, hitting 7 sixes and 7 fours in a blistering 96 from just 63 balls to break the back of the chase.
'Doc' himself went to make 89 as the six wickets win was achieved in 43 overs.
Waringstown will have the chance to make it a four-way tie at the Premier summit on Sunday in their T20 against Carrickfergus, and they will be well rested after a ten-wicket demolition of Cregagh.
Two early wickets for Graham Hume set the tone, as Cregagh's innings stuttered and spluttered to just 60 all out - four wickets for Ben Snell plus two as well for Jamie Gibson and Ross Allen.
Skipper Lee Nelson (39*) and Adam Dennison (18*) knocked off the runs with minimum fuss from the first ball of the 13th over.
Ruhan Pretorius top scored with 97 as Woodvale earned a deserved 81-runs win against CSNI.
Ruhan Pretorius scored 97 for Woodvale
It didn't look very encouraging for the Ballygomartin side as they slumped to 120 for 8 - three wickets for Luke Georgeson and a brace for Ben Mackey.
Pretorius though found valuable support in number 10 Paul Robinson (28) and the pair's 8th wicket stand of 86 was to prove decisive - a final total of 209 always likely to be challenging in tough conditions.
Robinson and Kyle Walsh each took three wickets as CSNI were dismissed for 128, despite the best efforts of Corin Goodall (38) and Luke Georgeson (28).
Instonians were comfortable seven wickets winners against Cliftonville Academy in the final game of the day.
Chasing 195, half centuries from Adam Ly and James Metcalfe, allied with 36 from Cade Carmichael ensured full points.
Cregagh (0) lost to Waringstown (4) by 10 wickets
Cregagh 60 (26 overs, B Snell 4-12, R Allen 2-7, J Gibson 2-13)
Waringstown 63-0 (12.1 overs, L Nelson 39*)
Woodvale (4) beat CSNI (0) by 81 runs
Woodvale 209-9 (50 overs, R Pretorius 97, P Robinson 29, L Georgeson 3-41, B Mackey 2-14)
CSNI 128 (40.5 overs, C Goodall 38, L Georgeson 28, K Walsh 3-3, P Robinson 3-20, A Adey 2-7)
North Down (0) lost to CIYMS (4) by 6 wickets
North Down 242-8 (50 overs, N Bran 110*, T Mayes 36, A Shields 27, G Kennedy 3-36, J Mulder 2-26, KI Dudgeom 2-46)
CIYMS 246-4 (43.0 overs, R Adair 96, C Dougherty 89*, J Beattie 28, Husnain Maroof 2-33)
Instonians (4) beat Cliftonville Academy (0) by 7 wickets
Cliftonville Academy 194-8 (50 overs, M Burton 40, M McCord 38, D Hendricks 24, A White 3-31, J Rose 2-39)
Instonians 195-3 (38.1 overs, A Ly 69no, J Metcalfe 53, C Carmichael 36)