Ardscoil must now beat rivals West Limerick Colleges next week in a derby clash to keep alive hopes of making the last eight.
This was a below-par performance from Ardscoil, who managed five points from play over 67 minutes. Limerick underage star Ronan Lynch, one of seven Na Piarsaigh players in the starting line-up, had seven points from placed balls. In contrast, Thurles had scores from eight players, including all six starting forwards.
Subs Michael O’Connor and Paul Kennedy were also on the scoresheet but it was the inside line that was most clinical. Jack Butler, Matty Stakelum and Robbie Long goaling, the latter starring, hitting 1-3.
Just three points separated the sides at half-time and while Ardscoil unloaded with a run of five unanswered points, goals either side of that purple patch kept Thurles in the hunt. Butler struck first in the ninth minute and with Thurles desperately in need of a score following a 14-minute barren spell, the corner forward set up Stakelum for a well-taken second goal four minutes before half-time.
Long tagged on a point as Thurles led 2-3 to 0-6 at half-time and a quickfire 1-1 after the restart effectively sealed victory.
Scorers for Ardscoil Rís: R Lynch 0-7 (6f, 1 65), P Casey 0-2, C Boylan, C Houlihan & A Gillane 0-1 each.
Scorers for Thurles CBS: R Long 1-3, J Butler 1-1, M Stakelum 1-0, R Teehan 0-3f, M O’Connor 0-2, N Heffernan, K Duggan & P Kennedy 0-1 each.
ARDSCOIL RÍS: S Mullane; M Andrews, P Collins, S Hogan; S Phelan, T Grimes, N Fox; J Flynn, M Mackey; C Houlihan, R Lynch, P O’Loughlin; P Casey, C Boylan, A Gillane.
Subs: K Howard for Phelan (41), J Boylan for Hogan (44), D Fitzgerald for O’Loughlin (47), E Mulcahy for Fox (47), E Ryan for Gillane (56).
THURLES CBS: W Tierney; D Quirke, E Heffernan, J Derby; C McCullagh, J Skehan, R Heffernan; B McCarthy, C Moloney; R Teehan, K Duggan, N Heffernan; J Butler, M Stakelum, R Long.
Subs: M O’Connor for Stakelum (45), P Kennedy for Moloney (45), B Kelly for Duggan (56), R Purcell for Long (60+1), C Cummins for Derby (60+5).
Referee: Tommy Ryan.