Morton stunned Premiership Motherwell to become the first side through to the Scottish Cup quarter-finals.
The second-tier side from Greenock led when Robbie Muirhead’s corner went in off Motherwell’s Harry Paton.
George Oakley, who had earlier struck the woodwork, doubled the hosts’ advantage with a firm low drive.
The visitors reduced their deficit when Jack Vale’s shot deflected into the net off Darragh O’Connor, but they could not avoid a first defeat of 2024.
The draw for the last eight will take place on Sunday on BBC One Scotland during Sportscene’s coverage of Airdrieonians v Hearts, with the programme starting at 16:30 GMT.
And 1922 winners Morton, who are unbeaten in 13 games, will aim to reach the semi-finals of the competition for the first time since 1981.
Motherwell goalkeeper Liam Kelly avoided early embarrassment when he spilled a free-kick, the Scotland international recovering before anyone could capitalise.
Dougie Imrie’s hosts had another near thing when Oakley latched on to O’Connor’s header and lifted a shot on to the crossbar.
The visitors simply could not get into a rhythm and fell behind from Muirhead’s set-piece. The fierce delivery from the right was palmed by Kelly on to Paton and back over the line.
The second period followed much in the vein of the first. Oakley pounced on a loose ball, bore down on goal and struck through the legs of Calum Butcher to beat Kelly.
A triple change from Motherwell that gave Jili Buyabu his debut and also introduced Adam Devine and Vale was followed by Andy Halliday and fit-again Jon Obika appearing from the bench as manager Stuart Kettlewell tried to engineer a comeback.
And Motherwell rallied. Theo Bair threatened with a header that Ryan Mullen claimed comfortably then Vale curled an effort wide shortly before he collected Devine’s pass and scored via O’Connor’s intervention.
The final few minutes were tense but Morton stood firm.
Player of the match – George Oakley
The striker was a persistent nuisance to the Motherwell defence and took his goal well.
What they said
Morton manager Dougie Imrie: “I’m absolutely delighted. This is a massive victory for the club. I’m really happy for my players. We managed to get the second goal at the right time.
“The back four handled [Blair Spittal and Theo Bair] very well. We tried to pack the midfield. To a man, my players were outstanding and I’m proud of them. If we can get a home tie and we can get this kind of support, we’ll take anybody.”
Line-ups
Morton
Formation 4-2-3-1
- 1Mullen
- 26French
- 5Baird
- 4O’Connor
- 3StrappBooked at 48mins
- 20PowerBooked at 67minsSubstituted forQuitongoat 82′minutes
- 27Wilson
- 8Blues
- 14CrawfordSubstituted forMcGrattanat 82′minutes
- 9MuirheadBooked at 37minsSubstituted forBroadfootat 90+1′minutes
- 22Oakley
Substitutes
- 6Waters
- 10Quitongo
- 15Broadfoot
- 17McGrattan
- 18Garrity
- 19Bearne
- 21Gillespie
- 41Murdoch
Motherwell
Formation 3-4-2-1
- 1Kelly
- 5MugabiBooked at 87mins
- 66ButcherBooked at 90mins
- 16McGinn
- 2O’DonnellSubstituted forDevineat 57′minutes
- 17ZdravkovskiSubstituted forValeat 57′minutes
- 38MillerSubstituted forObikaat 68′minutes
- 3GentSubstituted forBuyabuat 57′minutes
- 12PatonSubstituted forHallidayat 68′minutes
- 7Spittal
- 14Bair
Substitutes
- 9Obika
- 11Halliday
- 13Oxborough
- 15Casey
- 19Nicholson
- 20Blaney
- 21Devine
- 27Buyabu
- 28Vale
- Referee:
- John Beaton
- Attendance:
- 5,167
Live Text
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Match ends, Greenock Morton 2, Motherwell 1.
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Second Half ends, Greenock Morton 2, Motherwell 1.
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Foul by Jonathan Obika (Motherwell).
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Kirk Broadfoot (Greenock Morton) wins a free kick in the defensive half.
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Delay over. They are ready to continue.
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Delay in match because of an injury Davor Zdravkovski (Motherwell).
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Calum Butcher (Motherwell) is shown the yellow card for a bad foul.
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Foul by Calum Butcher (Motherwell).
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Jai Quitongo (Greenock Morton) wins a free kick in the defensive half.
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Substitution, Greenock Morton. Kirk Broadfoot replaces Robbie Muirhead.
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Calum Butcher (Motherwell) wins a free kick in the defensive half.
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Foul by Robbie Muirhead (Greenock Morton).
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Bevis Mugabi (Motherwell) is shown the yellow card for a bad foul.
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Foul by Bevis Mugabi (Motherwell).
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Robbie Muirhead (Greenock Morton) wins a free kick on the left wing.
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Goal! Greenock Morton 2, Motherwell 1. Jack Vale (Motherwell) right footed shot from the right side of the box to the centre of the goal. Assisted by Adam Devine.
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Attempt missed. Jack Vale (Motherwell) right footed shot from the left side of the box is close, but misses to the right.
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Attempt saved. Theo Bair (Motherwell) header from the centre of the box is saved in the top centre of the goal.
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Substitution, Greenock Morton. Lewis McGrattan replaces Robbie Crawford.
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Substitution, Greenock Morton. Jai Quitongo replaces Alan Power.
How to play
Rate players out of 10 throughout or after the game. The rater will close 30 minutes after the final whistle.
Rating range key = Give it up = Pure perfection
Greenock Morton
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Squad number1Player nameMullen
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Squad number26Player nameFrench
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Squad number5Player nameBaird
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Squad number4Player nameO’Connor
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Squad number3Player nameStrapp
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Squad number20Player namePower
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Squad number27Player nameWilson
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Squad number8Player nameBlues
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Squad number14Player nameCrawford
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Squad number9Player nameMuirhead
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Squad number22Player nameOakley
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Squad number10Player nameQuitongo
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Squad number15Player nameBroadfoot
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Squad number17Player nameMcGrattan
Motherwell
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Squad number1Player nameKelly
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Squad number5Player nameMugabi
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Squad number66Player nameButcher
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Squad number16Player nameMcGinn
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Squad number2Player nameO’Donnell
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Squad number17Player nameZdravkovski
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Squad number38Player nameMiller
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Squad number3Player nameGent
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Squad number12Player namePaton
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Squad number7Player nameSpittal
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Squad number14Player nameBair
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Squad number9Player nameObika
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Squad number11Player nameHalliday
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Squad number21Player nameDevine
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Squad number27Player nameBuyabu
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Squad number28Player nameVale
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