Emma Butler's five wicket haul helped Clontarf Women beat YMCA by 10 wickets, while Leinster edged out Malahide in a hard-fought contest.
Right-arm medium pacer Butler had the excellent figures of 5 for 23 as YM posted an under par 89 for 8.
Robyn Lewis top scored with 27 for the Claremont Road side, while Sarah Forbes (13) and Jenny Gray (12) also reached double figures.
The modest target proved little trouble to the Castle Avenue side, with in-form Una Raymond-Hoey hitting five boundaries in an undefeated 46 from 42 balls, sharing an opening stand of 90 with Aoife Brennan (30*) as they raced to victory.
The Leinster versus Malahide clash was an altogether closer affair with just 14 runs separating the sides.
Isabel Saeed-Maguire (27) and Rebecca Stokell (23) added 59 for the first wicket to set Leinster on their way.
Ellen Ridgeway (40) and Sophie MacMahon (35*) kept the momentum going with a stand of 66 in seven overs as the Rathmines side posted 150 for 6.
Amy Hunter's 59 from just 45 balls (7 fours, 1 six) helped Malahide to 113 for 1 in the 14th over before they collapsed alarmingly.
Leinster held their nerve as a disciplined bowling display in the closing stages as Malahide finished on 136.
The scheduled Pembroke v Merrion game fell victim to the weather, but the sides will face each other next week in the cup.