Shannon 22 Clontarf 13
Shannon avenged their recent league defeat to Clontarf as they overpowered the Dubliners in the AIB Cup at Thomond Park.
The Limerick giants plotted their course for the quarter-finals when centre Pat O'Connor and props Les Hogan and Tony Buckley all touched down in the first half.
A sizzling break from Andrew Finn teed up O'Connor's 18th-minute try, then lineout and scrum drives sent Hogan (23) and Buckley (40) crashing over.
Tarf cut into the hosts,19-3 interval lead when hooker Niall Carson was pushed over and although prop Johnny Wickham also scored off a 75th-minute lineout, Shannon held firm.