Sligo Rovers 1 Bohemians 0
Sligo Rovers blew the title race open as they ended champions Bohemians' nine-match unbeaten run with their first win in five games.
What proved the only goal of the game came on 16 minutes.
Jason McGuinness upended Raffaele Cretaro inside the area and central defender Alan Keane stepped up to shoot the penalty past Brian Murphy.
Glen Crowe wasted a chance to level just before the break while a clearance by Keane ricocheted off team-mate Romu Boco onto the home crossbar as Rovers held on for a big win.
Bohs are now just four points ahead of second-placed Shamrock Rovers.