Merrion won a tough contest - Swapnil Modgill (78), Sam Harbinson (73) and Michael Lewis (54*) helped set a target of 267 - with Waringstown's Bilawal Bhatti taking 5-38. Despite James McCollum's 52 and Graham Hume's 58, the NCU side fell short.
Saqib Bahadur's 85 and Joe Carroll's 67 weren't enough as defending champions Leinster crashed out of the Cup to CIYMS. The Belfast side chased 244 with 11 overs to spare, with Max Burton (82) and Tyron Koen (78) leading the way with a 173-run stand.
Alistair Shields' 56 was the only innings over fifty as North Down lost to Phoenix. The Park team easily chased 173 with 15 overs and 7 wickets to spare.
Instonian's looked in early trouble, bowled out for 199, with Nikolai Smith (56) leading from the front. However, the Belfast side knocked Malahide over for just 81, with Cian Robertson with 4-23 the chief destroyer.