Leinster Lightning hold the upper hand over North West Warriors after the opening day of their three-day interprovincial match at Malahide.
An unbroken last-wicket partnership of 109 between Max Sorensen and Albert van der Merwe saw Leinster close Tuesday's play on 299-9.
The pair came together with the hosts in trouble at 190-9.
Craig Young took four wickets, Stuart Thompson and Ernest Kemm two and Johnny Thompson one for the Warriors.
In addition to this wicket-taking quartet, Jarred Barnes bowled superbly for scant reward on his Warriors debut.
Hills pace-man Sorensen had been involved in a 93-run last-wicket stand with Fintan McAllister at Bready just six weeks ago to wrestle the reverse fixture away from the hosts.
Bill Coghlan held the top order together with 12 fours in his 61 before he became the third of Young's four victims, while Cormac McLoughlin did his reputation no harm either with a timely innings of 30.
Cameos from Eddie Richardson (17) and John Mooney (16) kept the board ticking along however with the last pair together and the total still shy of 200 an upset looked on the cards.
Then came the Sorensen and van der Merwe show - the former hitting five fours in his patient 68, while the YMCA skipper is just one short of his half century when battle resumes on Wednesday morning.
Meanwhile North Down will face CSNI in the Twenty20 Cup final at Waringstown on Friday 18 July.
NEWSTALK INTER-PROVINCIAL CHAMPIONSHIP
At Malahide, Day one close of play
LEINSTER LIGHTNING 299-9 (105 overs, M Sorensen 68*, B Coghlan 61, A van der Merwe 49*, C McLoughlin 30, C Young 4-74, S Thompson 2-46, E Kemm 2-56) v NW WARRIORS
LAGAN VALLEY STEELS TWENTY20 CUP
Instonians v CSNI
Instonians 141-8 J Shannon 53 no
CSNI 142-5 G Nieuwoudt 71 no (43 balls)
CSNI won by five wickets
Waringstown v North Down
Waringstown 133 S Khan 55
North Down 134-7 D Graham 48 no
North Down won by three wickets