Sligo Rovers fell to their first defeat of 2017 as they were beaten by Galway United at Eamonn Deacy Park.
Ronan Murray's neat chipped effort won the tie late on for the home team.
It was the away side who fired the first shot in anger in this Connacht derby. Sadlier's shot from 30 yards sailing over former Rovers keeper Ciaran Nugent's crossbar.
Galway fashioned their first opportunity of the game five minutes later. Vinny Faherty's glancing header flashing past the face of Micheal Schlingermann's goal.
Schlingermann was comfortable in dealing with Paul Sinnott's effort after Liam Martin conceded possession close to the centre circle.
Another former Rovers man, Stephen Folan was next to go close on 34. Kyle Callan-McFadden upended Faherty before Folan's bending effort narrowly avoided Schlingermann's crossbar.
Folan whipped another dangerous set piece past the Rovers post shortly before the break.
Gavan Holohan's mis-hit cross almost deceived Schlingermann after it caught the breeze on 53 but the Mayo man recovered well to gather.
Sadlier shot wide from the outside of his left boot just past the hour mark.
Substitute Raffaele Cretaro brought a super save out of Conor Winn on 64 as the Rovers striker met Gary Boylan's cross from the right.
Gavan Holohan was next to go close from a set piece for the Tribesmen on 74. The former Cork winger slamming his shot just past the Sligo post.
Shane Keegan charges won the game in its last breath. Murray dinking the ball over Schlingermann.
Galway: Galway: Nugent, Horgan, Ludden, Grace, Folan, Sinnott, Melody, Holohan, Cawley, Faherty, Devers.
Rovers: Schlingermann, Adebayo-Rowling (Boylan 51), Leahy (Mahon 80), Callan-McFadden, Donelon, Sadlier, Kenny (Keaney 87), Russell (Kearns 46), Martin (Roddan 46), Stevens (Cretaro 62), Ayunga (Place 62).
Referee: Marc Lynch.