Castletroy College caused an upset at Annacotty after doing all their scoring in the first half and withstanding a late rally from Crescent in an entertaining game.
It looked destined for extra- time when Crescent scored a spectacular try five minutes from the end. They launched a sweeping move from their own 10-metre line which culminated with winger Gary O'Sullivan touching down.
However, Calvin Nash failed to convert and had earlier missed with a penalty chance which would have given his side the lead after 10 minutes.
Castletroy went in front with a penalty by Conor Linehan instead and when Niall O'Shea got in for a try after 34 minutes, Linehan converted to leave his side 10-0 clear.
Nash hauled Crescent back into the game with a penalty, before Linehan was off target with his penalty attempt. Then came the late Crescent try, which ultimately proved in vain.
Castletroy College -- B Donovan; P Morrissey, B Nash, S Hoare, J Porter; C Linehan, R Cunningham (capt); E Fitzgerald (D Kennedy), L Lyons, M Finucane, (S Shinnors); J Doyle, S O'Hara; D Rowsome, N O'Shea, R Murphy.
Crescent Comprehensive -- G Dickenson; G O'Sullivan, S Eades, C Nash, B O'Hora; J Harrington, P Spillane; C Moloney (D McDonnell), S Hensey, M McGann (capt); E Prendergast, C Reale; A Harrisson (S Naughton), S Fitzgerald, O Quinlan.
Ref -- R Horgan (MAR)