David McDaid was on target for Derry City
Derry City defeated Mervue United in Monday's EA Sports Cup third round tie at the Brandywell.
David McDaid gave the Candystripes the lead with a penalty in the seventh minute and Michael McCrudden added the second with a goal in the 56th minute.
The visitors secured a late consolation goal when Alex Lee found the net in added time.
The Candystripes had defeated First Division strugglers Salthill Devon in the previous round of the competition.
