Match ends, Inverness CT 1, Morton 0.
Carl Tremarco's early goal saw Inverness Caley Thistle secure just their third home Championship win of the season to cement fourth place.
The Caley captain headed home Liam Polworth's 11th-minute corner at the near post for what proved the winner.
Brad McKay should have doubled the lead when he headed over from three yards and Gregor Buchanan cleared Tremarco's second-half header off the line.
Charlie Telfer and Chris Millar came closest for a blunt Morton side.
Polworth, Coll Donaldson, Aaron Doran and Jordan White could have added further goals for Thistle, who are five points clear of Dunfermline in the final play-off spot.
Inverness CT boss John Robertson: "We created plenty of chances today but we had to hang on. The last five or six minutes we decided to just take what we had. I cannot praise the players highly enough for their attitude and application.
"They gave it everything and they gave absolutely everything they had on Tuesday [in a Scottish Cup win over Ross County on penalties] and absolutely everything today so it's a wonderful three points. It was a massive performance from them."
Morton manager Jonatan Johansson: "I'm disappointed with the result obviously and I'm also disappointed in the way we lost the goal - another set-play. I know we are a small team but we need to be better at defensive set plays - they've been costing us for a while now.
"Before that I felt everything was going alright. I think we played some nice passing football but in the final third we didn't have the spark or belief and it was powder-puff at times. We never really threatened them."
- 6McCartSubstituted forDonaldsonat 32'minutes
- 3TremarcoBooked at 36mins
- 17McDonaldSubstituted forMcCauleyat 45'minutes
- 10Doran Cogan
- 7PolworthSubstituted forTraffordat 83'minutes
- 6TelferSubstituted forTidserat 60'minutes
- 15DykesSubstituted forLyonat 70'minutes
- 17O'ConnellSubstituted forTumiltyat 59'minutes
- Steven Reid
- Shots on Target
Second Half ends, Inverness CT 1, Morton 0.
Corner, Morton. Conceded by Brad McKay.
Attempt missed. Darren McCauley (Inverness CT) right footed shot from the right side of the box misses to the left.
Foul by Jordan White (Inverness CT).
Kerr Waddell (Morton) wins a free kick in the attacking half.
Substitution, Inverness CT. Charlie Trafford replaces Liam Polworth.
Attempt missed. Michael Tidser (Morton) left footed shot from outside the box is too high.
Corner, Morton. Conceded by Carl Tremarco.
Attempt saved. Aaron Doran (Inverness CT) right footed shot from outside the box is saved in the centre of the goal.
Delay in match Coll Donaldson (Inverness CT) because of an injury.
Coll Donaldson (Inverness CT) wins a free kick in the attacking half.
Foul by Bob McHugh (Morton).
Attempt blocked. Aaron Doran (Inverness CT) right footed shot from the left side of the box is blocked.
Attempt missed. Coll Donaldson (Inverness CT) header from the centre of the box is too high.
Corner, Inverness CT. Conceded by Gregor Buchanan.
Attempt saved. Liam Polworth (Inverness CT) right footed shot from the centre of the box is saved in the bottom right corner.
Substitution, Morton. Reece Lyon replaces Dylan Dykes.
Attempt missed. Carl Tremarco (Inverness CT) left footed shot from outside the box is too high.
Attempt missed. Jordan White (Inverness CT) right footed shot from the centre of the box is too high.