Ryan Conroy bagged a brace as Dundee climbed to second with a 2-0 win over 10-man Morton at Cappielow Park.
Striker Conroy opened the scoring after a quarter of an hour when Andy Graham fouled Kevin McBride in the area and Conroy calmly stepped up to stroke the ball into the bottom corner.
The home side almost got back on level terms four minutes later when Peter MacDonald's drilled effort was blocked behind for a corner and the same player headed the resulting set-piece narrowly over.
Morton goalkeeper Alan Combe then tipped Carl Finnigan's header over on the half-hour mark before Conroy found space in the area to fire past Combe for his seventh goal of the season 10 minutes after the interval.
Things got worse for the home side when striker Peter Weatherson was shown a straight red card for a foul on Jamie McCluskey after 64 minutes.