The Saints substitute grabbed the only goal of the game to give the SPL bottom side a major confidence boost, as well as subjecting Rangers to their first defeat of the season.

This was Rangers' last ever visit to Love Street before St Mirren move to their new stadium and McGinn's strike was a fitting way to mark the occasion.

In Sunday's other game, Motherwell bounced back from European disappointment in midweek by edging an open clash with Falkirk 3-2 at Fir Park.

John Sutton's fifth goal in six SPL games proved to be the winner after the visitors had twice pegged back their hosts.

Jamie Murphy and Chris Porter put Motherwell ahead only for Steve Lovell and Graham Barrett to level.

Well played some of their best football of the season and some sloppy defending contributed to the excitement.