Morton moved further away from the relgation play-off zone thanks to a win over Partick at Cappielow Park.
The hosts got off to a flying start when Peter MacDonald rose highest to head home Michael Tidser's cross in the eighth minute.
Stephen O'Donnell came closest to an equaliser on the half-hour mark but Alan Combe did well to tip his effort over the bar.
Chances were at a premium after the interval with the visitors knocked out of their stride by the early goal.
O'Donnell turned provider after the hour-mark to find Chris Erskine but Combe made another good stop with his feet.
The victory lifts Allan Moore's side eight points clear of second bottom Ayr United as they extend their unbeaten run to four matches.
Morton: Combe, Evans, Graham, Smyth, Forsyth, Flannigan (O'Ware 17), Bachirou, Derek Young, Tidser, MacDonald, Campbell (Jackson 56), O'Ware (McGeouch 46). Subs Not Used: McGinley, Weatherson.
Booked: Derek Young. Goal: MacDonald 8.
Partick Thistle: Fox, O'Donnell (McAleer 73), Robertson (Balatoni 11), Archibald, Sinclair (McGuigan 23), Paton, Cairney, Welsh, Bannigan, Erskine, Doolan. Subs Not Used: Scully, Elliot.
Booked: Archibald, Paton.
Ref: Steven McLean