Ten-man Derry City held Premier Division leaders Shelbourne to a 0-0 draw at Tolka Park on Monday night despite having defender Sam Todd sent off in the first half.
The result keeps second-placed Derry three points off the summit, with Shels having one game in hand over the Candystripes.
It marked the sixth successive stalemate between the sides. But though Duff has now not beaten Derry in their last 10 meetings, his side remain three points ahead of their chief rivals with a game in hand in stretching their unbeaten league run to five games.
Not having played in 15 days, while Shelbourne had two tough European games to contend with, Derry showed plenty of energy early on and should have been ahead from the game’s first clearcut opening on 15 minutes.
Will Patching’s diagonal free-kick was headed on in turn by Sam Todd, Ciaran Coll and skipper Patrick Hoban. Michael Duffy spun Shelbourne skipper Mark Coyle only to shoot straight at Conor Kearns who batted the ball away.
The winger might have done better again five minutes later, cleverly cutting past Sam Bone onto Cameron Dummigan’s ball over the top before shooting wide, if from a tight angle.
Shelbourne, with six changes from Thursday’s game with FC Zurich, remained on the back foot as they laboured to get a foothold in the game before Derry’s momentum was disrupted on 35 minutes when they were reduced to 10 men.
Centre-back Todd, booked early on for a foul on Liam Burt, needlessly pulled the Shels winger back inside the home half and duly received a second yellow card and was sent off.
It was the 42nd minute before Shelbourne finally got their first sight of goal; Coyle just unable to connect with Harry Wood’s arced free kick into the area.
With the game opened right up now, both sides had chances before the interval.
Duffy yet again wasted an opportunity, once more shooting straight at Kearns after the keeper had sent a clearance right to him.
Shelbourne went straight down the other end to cut Derry open for the first time. A Will Jarvis cross was teed up by JJ Lunney for Wood whose drive was blocked by the alert Dummigan.
Duff made a change at the interval, bringing on Evan Caffrey for skipper Coyle in a more attacking formation.
Despite their numerical disadvantage, it was Derry who started the second half as they did the first with Doherty and Hoban having half chances.
Shelbourne soon took command of the ball, though, stretching Derry just before the hour. Jarvis slalomed down the left to set up Wood whose drive brought the save of the game from Brian Maher.
The ball remained alive, Burt crossing for substitute Matty Smith who looped his header over the top.
With the 10 men tiring, space opened up for Shelbourne into the final third of the game.
They couldn’t make it count, however. The best they could muster saw Jarvis pick out substitute Ali Coote with the Scot’s low shot deflected out for a corner.
Shelbourne: Conor Kearns: Sean Gannon, Sam Bone, Shane Griffin, Kameron Ledwidge; JJ Lunney, Mark Coyle (Evan Caffrey, h-t), Harry Wood (Rayhaan Tulloch, 74); Liam Burt (Ali Coote, 74), John Martin (Matty Smith 57), Will Jarvis.
Derry City: Brian Maher; Ciaran Coll, Mark Connolly, Sam Todd, Ben Doherty; Cameron Dummigan, Will Patching; Paul McMullan (Daniel Kelly 69), Adam O’Reilly, Michael Duffy (Danny Mullen 78); Patrick Hoban (Sadou Diallo 90).
Referee: Damien MacGraith (Mayo).
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