A top-of-the-table clash resulted in the Panthers' first home defeat of the National League season.
Portlaoise Panthers lost their perfect home record in Division One of the National League last weekend.
The Laois club hosted fellow table toppers Limerick Celtics with their head coach Jack Scully, and one of their key players Cillian O'Connell in Belfast for the National Cup Under 18 quarter finals.
The final score in St Mary's Hall was 79 points to 90.
While there was also heartbreak for the under 18s.
They led by one point with 22 seconds left on the clock against Belfast Phoenix who won through to the semi-final from the free throw line at the death.
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