First-half goals from Alfredo Morelos and Connor Goldson had Steven Gerrard's side in control despite a red card for Ross McCrorie before the break.
In the day's other game, it finished 1-1 between St Johnstone and Hibernian at McDiarmid Park.
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Sunday 12th August 2018
Rangers defeated St Mirren 2-0 at Ibrox in the Ladbrokes Premiership on Sunday.
First-half goals from Alfredo Morelos and Connor Goldson had Steven Gerrard's side in control despite a red card for Ross McCrorie before the break.
In the day's other game, it finished 1-1 between St Johnstone and Hibernian at McDiarmid Park.