Dumbarton 3 - 1 Morton: Colin Nish scores on debut
Nish picked out Mitchel Megginson with a back post cross on 18 minutes and the former Aberdeen striker kept calm after his initial header hit the bar to nod in the rebound from four yards out.
Team-mate Scott Smith was not so composed 30 seconds later as he swiped the feet from Dougie Imrie in the box and Imrie netted the resultant spot-kick with ease.
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Hide AdFormer Dumbarton player Tony Wallace was denied by Jamie Ewings in the home goal and Derek Gaston turned over a fine drive from Smith before the hosts took the lead three minutes from the break.
Scott Taggart was yards shot with a passback and Nish showed his experience as he drew Gaston from his line and rolled the ball into the far corner.
In the second half, Reece Hands came close to a leveller with a fine low drive that Ewings finger-tipped away before the points were secured when Smith swung over a cross from the left and substitute Steven McDougall glanced home the perfect header.