Dumbarton claimed their first win of the season with a victory over Morton that allowed them to leapfrog their opponents in the Championship table.
Mitchel Megginson tapped the ball home for the Sons after his initial header came back off the bar.
Dougie Imrie beat Jamie Ewings to equalise from the spot to level after Scott Smith was fouled shortly after.
But Colin Nish pounced on a poor back-pass and, after the break, sub Steven McDougall headed the Sons' third.
Dumbarton: Ewings, McGinn, Graham, Barry, Scott Smith, Turner, Ian Murray, Agnew (Prunty 83),Gilhaney, Megginson (McDougall 61), Nish (Fleming 70). Subs Not Used: Grindlay, Kevin Smith, Horne, McKerracher.
Goals: Megginson 18, Nish 42, McDougall 84.
Morton: Gaston, Taggart, Mark McLaughlin, Michal Habai (Page 46), Peciar, Wallace (Fulton 74), Hands, Bachirou, Imrie, Cham, O'Brien (Campbell 46). Subs Not Used: Fitzpatrick, Caraux, McNeil, Verlaque.
Goals: Imrie 19 pen.
Ref: William Collum