Relihan’s defense keys Prep’s win

FILE PHOTO Prep’s Tommy O’Neil (right) scored 17 points in Friday’s win over Catholic Memorial.  By GORDON VINCENT DANVERS — Friday night’s Catholic Conference showdown between St. John’s Prep and Catholic Memorial can be broken down into two segments – before Nate Hobbs’ dunk and after. Hobbs’ slam sparked a 13-0 run that gave the…