Niall McGinn's strike after 35 minutes gave Celtic a 1-0 victory over Morton in their Active Nation Scottish Cup fourth-round tie at Cappielow.
The Clydesdale Bank Premier League side had edged a decent first half without unduly troubling Ton goalkeeper Colin Stewart.
However, 10 minutes from the break Hoops striker Marc-Antoine Fortune cut the ball back for the former Derry City player who drove past Stewart from 12 yards and from then on the visitors looked comfortable.
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