Leinster Lightning comfortably beat North West Warriors by 141 runs at Strabane in Monday's one-day 50-over inter-provincial between the sides.
Leinster had defeated Northern Knights by six wickets in the same format.
The third wicket partnership of 202 between John Anderson and Simi Singh swung the game in the visitors' favour.
Singh scored 136 off 135 balls as Lightning amassed 332-7 with Warriors replying with 191 off 41.3 overs, Singh taking four wickets for only 16 runs.
Leinster Lightning 332-7 (50 overs) S Singh 136, A Poynter 53, S Thompson 4-64
North-West Warriors 191 (41.3 overs) M Marais 66, A McBrine 25, S Singh 4-16
Leinster Lightning won by 141 runs