Roberts, impressive on his full debut in midweek, capitalised on a slack pass from Paul Hanlon on 13 minutes but Darren McGregor prevented the cross to an unmarked Tony Watt.
Christopher Cadden was making his first appearance against his former club and he went close on 15 minutes.The Motherwell academy graduate collected a cross on the angle of the box and he fizzed a powerful shot just over the bar.
The Steelmen's first chance arrived on 21 minutes through Allan Campbell. Cole slipped the combative midfielder through on goal but his powerful shot was blocked by a brilliant tackle from McGregor.Motherwell didn't have to wait long until their next chance as Roberts fired the visitors ahead on 25 minutes.
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