Morton stayed in touch with First Division leaders Partick Thistle with victory against Airdrie United.
The hosts took the lead shortly before half-time, David Graham heading home David O'Brien's fine cross.
Martin Hardie doubled the advantage seven minutes from the end when he fired Michael Tidser's cross into the net.
Goalkeeper Grant Adam prevented Anthony Wallace adding a third in the final minute.
Morton: Gaston, Taggart, Rutkiewicz (O'Ware 23), Mark McLaughlin, Dyer, Bachirou, Hardie, Tidser, Graham (MacDonald 76), O'Brien, Weatherson (Wallace 65). Subs Not Used: Hutton, Campbell.
Booked: Mark McLaughlin, O'Brien.
Goals: Graham 43, Hardie 83.
Airdrie Utd: Adam, Evans (O'Neil 66), Lilley, Gregor Buchanan, Warren, Josh Watt (McLaren 61), Barclay, Blockley, Bain (Lynch 61), Liam Buchanan, Di Giacomo. Subs Not Used: Duncan, Donnelly.
Booked: Josh Watt, Evans.
Ref: Brian Colvin