Terenure beat Railway Union by nine runs in a low scoring game to take an early lead in the promotion race.
Heroes for the home side were the opening bowling duo of Mark Thomas and Zubair Khan, who were chiefly responsible for the Park Avenue's sides failure to chase 104.
Thomas claimed 4 for 23 in an impressive ten-overs spell, backed up by Zubair's 3 for 41.
Kenny Carroll had thumped seven boundaries in a hard-hit 31, before the wheels fell off in spectacular fashion as they slumped to 77 for 9, before being given some hope of a repeat of Saturday's one-wicket win against Balbriggan.
However Bhavic Tukrel bowled Ciaran Diviney to seal the win.
The win was even more impressive given that Railway featured Irish international Kevin O'Brien in their ranks - run out on a rare appearance in domestic cricket.
Tukrel had top scored for Terenure with 42 (5 fours, 1 six), one of the few batsmen to master the conditions on a day when the ball dominated.
For Railway, there were two wickets apiece for Liam McCarthy, Andy Jackson, Oliver Perry and Prabanshu Kamal.