UCD 1 Derry City 0
Robert Doyle was hero and villain within 13 minutes of the start as he scored UCD's winner before getting himself sent off.
Doyle shot home a fifth minute penalty after Kevin Deery handled a Robbie Martin shot, but received his marching orders eight minutes later for a silly push on Sean Friars.
Derry were pushed throughout as UCD defended doggedly.
The closest City came to equalising when Clive Delaney cleared off the line from Ciaran Martyn.