Gerard Doherty made it six clean-sheets in a row, as Derry notched up five wins on the trot, following a comfortable 2-0 win over strugglers Bray Wanderers.
The match was effectively over as a contest at half-time as the home side raced into a two goal lead thanks to goals from Kevin Deery and Mark Farren.
Derry got off the perfect start when they took a deserved fourth minute lead thanks to a large slice of fortune as Deery saw his powerful drive from 20 yards take a massive deflection off Dave O’Neill, before looping over keeper Chris O’Connor.
The home side continued to press forward and a fantastic Ruairdhi Higgins cross in the 11th minute would have found skipper Peter Hutton at the back post, but Dave Massey cleared the danger.
Bray went even closer soon after when Paul Byrne got himself half yard away from Hutton, but his well hit drive was well kept out by Doherty, before Hutton mopped up the loose ball.
Derry doubled their advantage in the 37th minute when James McClean’s lay-off on the edge of the box found Farren and the striker planted the ball into O’Connor’s bottom right hand corner.
It was mostly City after the break but a super defensive header by Ger O’Brien saved them just after the hour mark as Paddy Kavanagh’s in-swinging centre would have picked out substitute John Mulroy, but for the former Shamrock Rovers man’s timely intervention.
Farren should have help his side grab a third in the 65th minute, but after breaking clear of the offside trap, he picked out the wrong pass instead of feeding an unmarked Gareth McGlynn, his cut-back to Morrow was easily cleared.
Derry were reduced to ten men in the 75th minute after Delaney was given his marching orders by referee Dave McKeon, after he incredibly lashed out at Kavanagh on the half-way line after the striker had won possession.
Derry City: Doherty, O’Brien, Delaney, Hutton, McCallion; McGlynn, Higgins, Deery, McClean; Farren, Morrow. Subs: McChrystal for McClean (76), McManus for Morrow (87); Martyn for Farren (90).
Bray Wanderers: O’Connor, Pender, Massey, O’Neill, Mulcahy, Brennan, Kavanagh, Robson, Byrne, Coughlan, McCabe. Subs: Mulroy for Coughlan (59); Kelly for McCabe (68), Knight for Massey (85).
Referee: Mr David McKeon (Dublin).