Debutants Ciaran Kilduff and David McMillan were on the scoresheet for their respective sides, but Daryl Horgan took all the plaudits with two goals against his former club
Cork's new attacking new partnership of Daryl Kavanagh and Ciaran Kilduff looked sharp in the early stages, but the visitors slowly gained control of the tie. However, despite good play on the ball in the middle of the park, Sligo couldn't create a real goalscoring opportunity, and were restricted to shots from range, with Ross Gaynor's early effort missing the target.
Sligo's new striker David McMillan was starved of support up front, but tried an ambitious overhead kick as the first half wound down. The sides went in scoreless at the interval, but it didn't take long for Cork to take the lead in the second-half.
A mistake from Joseph Ndo let Daryl Horgan in, and the winger did well to chip the ball over the onrushing Gary Rogers. Cork continued to attack, and grabbed a deserved second goal on 74 minutes when Shane Duggan played through Horgan, who finished well past Rogers again.
Anthony Elding had been sent on for the visitors, but it was debutant David McMillan who gave Sligo a lifeline, but it only lasted a minute as another defensive error restored Cork's lead. Gavin Peers was at fault, allowing Ciaran Kilduff to score from close range on his first game for the Leesiders.
With St Patrick's Athletic not playing this weekend due to Europa League action, Ian Baraclough will know that his side missed an opportunity to keep up the pressure on their title rivals.