John The Baptist Community School suffered a 0-24 to 0-15 defeat to the holders in round one of the Dr Harty Cup in Dundrum on Wednesday afternoon.
A tight first half kept the Limerick school well in the hunt until three late points doubled the winners' lead.
The Limerick side could have bridged the gap after the break had they converted a goal chance before their opponents moved into a match-winning lead going into the final quarter.
Outstanding individual performances from Cillian Minogue and Darragh Hickey for the winners and Riain McNamara and Shane O'Dea for John the Baptist lit up the game.
However, the greater depth of talent in the Thurles lineup proved to be the difference in the end.
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Author's summary: John The Baptist Community School lost to Thurles CBS.