Karl Sheppard scored twice as Derry City were well beaten by Cork City in Friday night's Premier Division game.
John O'Flynn gave the hosts a 17th-minute lead at Turner's Cross, stroking the ball into the net from eight yards.
Sheppard fired in the second from three yards out at the back post on the stroke of half-time.
The striker grabbed his second with a predatory finish into the corner of the net in the 69th minute as Derry fell to their third defeat of the campaign.
Unbeaten Cork remain second in the table, while Derry drop to seventh position on goal difference.
O'Flynn put the home side ahead by latching onto a left-wing cross to score and then Candystripes goalkeeper Ger Doherty was twice forced into action.
The Derry stopper was at full stretch to save Liam Miller's fiercely struck right-foot effort and then tipped over from John Dunleavy's attempt soon after.
Sheppard's goal before half-time put Cork in full control, then O'Flynn fired inches wide of the post soon after the interval.
After Sheppard extended the lead, Derry had two good chances to pull a goal back but Cillian Morrison's glancing header went just over and Patrick McEleney saw his drive crash off the underside of the bar.
Peter Hutton's side are in EA Sports Cup action on Monday afternoon when they travel to face Sligo Rovers (16:00 BST kick-off).