An early burst of goals set Morton on their way to victory against Ayr United to go top of the First Division.
Peter MacDonald's 25-yard free kick put the hosts ahead on 10 minutes and Andy Jackson quickly doubled the lead with a right-foot strike.
MacDonald slid home Jackson's pass to give Morton a 3-0 lead on 13 minutes.
An 88th-minute penalty by Mark Roberts reduced Ayr's deficit but Peter Weatherson converted a spot-kick of his own a minute later for Morton.
Stewart, Graham, Evans, McCaffrey, Forsyth, Di Giacomo, Smyth, Tidser (McGeouch 80), O'Brien (Fitzharris 74), MacDonald (Weatherson 65), Jackson. Subs Not Used: Deans, Bachirou.
MacDonald 10, Jackson 11, MacDonald 13, Weatherson 89 pen.
Cuthbert, John Robertson, Campbell, Smith, Malone, Duff (Connolly 58), McKernan (Trouten 75), Geggan, McGowan, Wardlaw (Roberts 58), Moffat. Subs Not Used: McWilliams, Ross Robertson.
Campbell, Geggan, Malone.
Roberts 88 pen.