Glentoran made it four wins out of five in the Irish Premiership with an easy victory over Institute at the Oval.
David Scullion netted a close-range opener in the 11th minute and Danny McKee tapped in on 28 minutes after Barry Holland's effort was blocked.
Jordan Stewart punished a mistake by keeper Marty Gallagher to make it 3-0 early in the second half.
Robbie Hume scored with a free-kick for Institute but Scullion's second goal of the game completed the Glens victory.
It means Glentoran's Boxing Day derby defeat at Linfield is the only time they have failed to take maximum points in their last five league fixtures.
They were always in the driving seat against Institute who have failed to register a win in 11 Premiership matches.
The fifth-placed Glens made an early breakthrough when Marcus Kane's cross was finished at the near post by Scullion.
A poor kick out by Gallagher left the visiting keeper stranded and when Holland's attempt was blocked it fell for McKee to snap up the second.
Things got worse for Institute when Dean Currie had to be stretchered off with a head injury after a collision with team-mate Stephen O'Donnell.
Stewart made it 3-0 in the 53rd minute after keeper Gallagher dropped the ball.
Hume's left-foot curler from just outside the penalty area got one back for Institute but Scullion had the final say by stroking in a shot which went in off the underside of the crossbar.