Despite being held scoreless by a tough UCD side, St Pats moved seven points clear at the top of the Premier Division, temporarily at least.
The Students tested the patience of the Saints in an uneventful encounter in Richmond Park by crowding the midfield and limiting the Inchicore men's space.
The home side started brightly but only had speculative efforts from Guy, Dempsey and Byrne before Mark Quigley had the game's best chance just after the half hour.
The league's joint top-scorer had his initial header blocked after good work by O'Neill down the right. However, the ball rebounded to him on the edge of the six yard box only for him to blaze his shot over Matt Gregg's goal.
While Alan Kirby hit the crossbar having created a chance out of nothing for himself the second half produced little else, with Brian King's man marking job on Keith Fahey restricting the league leaders' playmaker.
Fahey did have the ball in the net after 78 minutes but only after the offside flag was raised. Despite UCD having their only shot of the night in injury time neither team really looked like breaking the deadlock.