Peter MacDonald's early goal gave Morton an away win over Dundee.
The striker blasted home from close-range after good set-up work by David O'Brien on the right-hand side.
Dundee almost equalised just after half-time when Rhys Weston's volley was spectacularly saved by Morton goalkeeper Colin Stewart.
Michael Tidser had his close-range free-kick tipped around the post by Robert Douglas on the hour mark as Morton pressed for a second.
Dundee: Douglas, Irvine, McKeown, Weston, Lockwood, Riley (McCluskey 73), O'Donnell, Chisholm (Mcintosh 81), Conroy, Bayne (Hyde 61), Milne. Subs Not Used: Gibson, McGregor.
Morton: Stewart, McCann (Graham 46), Evans, McCaffrey, Forsyth, Di Giacomo, Tidser, Smyth, O'Brien, MacDonald (Weatherson 81), Jackson (McGeouch 72). Subs Not Used: Deans,Campbell.
Booked: Forsyth, Smyth.
Goals: MacDonald 7.
Ref: Frank McDermott