Ruhan Pretorius launched a savage assault on the CIYMS attack to lead North Down to a 40-run win at Belmont.
The South African all-rounder hit 9 sixes - five of which came off consecutive deliveries from Irish international Jacob Mulder.
Pretorius was unable to repeat his feat of six sixes in an over, achieved when playing for Waringstown against Clontarf in the Irish Cup, only managing a single from the last ball which had been preceded by a wide.
Still, 32 runs from the over saw North Down to 173 for 3, with Pretorius unbeaten on 87 from just 46 balls, while Ally Shields made 57 from 47 balls (6 fours).
Jacob Mulder conceded 58 from his four overs, while James Cameron-Dow went for 34 in 3 overs.
Nigel Jones took 1 for 9, but opening the batting fell first ball to Pretorius, who went on to claim 2 for 15.
Chris Dougherty (36), Ryan Hunter (28) and Jason van der Merwe (27) all got starts, but three wickets for Carl Robinson (3-18) and a brace from Peter Eakin (2-31) saw them finish on 133.
In the other game, Carrickfergus won a thriller, beating Muckamore by just two runs.
Alex Haggan top scored with an unbeaten 34 as Carrick posted 145 for 6 - Pat Botha (23) and Daniel Poulton (22) chipping in.
Fahad Iqbal took 3 for 25, and joint top-scored with 35 along with David Miller, but it wasn't enough in a thrilling contest.