The Saints lost their second game in 72 hours after a 3-2 defeat in poor conditions in Belfield.
The Saints took had a half-time lead courtesy of Danny North's wonderful effort in the first half.
UCD responded after the break with goals from David McMillan, Ciaran Kilduff and a penalty from Greg Bolger saw the student move into a 3-1 lead.
Seán Stewart scored a late consolation for Pats but it was too little too late for Pete Mahon's men.
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