Derry City 1 Cork City 4:Derry City are now playing catch-up having fallen nine points off the pace in the Premier Division following last night's embarrassing defeat to Cork City.
It certainly appears that Pat Fenlon has his problems, the Foylesiders having now lost at home for the second time in five league matches.
Cork, in what will surely be regarded as one of the best performances of the season, broke the deadlock when Roy O'Donovan drove the ball home after Derry's debutant goalkeeper Ola Tidman parried a John O'Flynn shot into his path in the 12th minute.
While the home side equalised three minutes later through Peter Hutton, Cork struck again four minutes before the break when Admir Softic took advantage of another defensive error.
It was clear that the visitors were content to defend their lead after the break and, with Derry failing to score, Cork struck again in the 80th minute.
A Darragh Ryan corner was headed home by Dan Murray before substitute Denis Behan rubbed salt into the Derry City wounds with a lobbed goal as the game entered injury-time.
DERRY CITY:Tidman; McCallion (McHugh 77 mins), Oman, Hutton, Rogers; McCourt (Moore, 27 mins), Higgins, Molloy, Brennan; Beckett (Hynes, 57 mins), Farren.
CORK CITY:Devine; Horgan, Kelly, Murray, Ryan; Lordan, Gamble, O'Donovan, Softic, Kearney (Woods, 83 mins); O'Flynn (Behan, 69 mins).
Referee: Ian Stokes (Dublin).