But Alexander looked more assured moments later when he made a goal-line save to deny Steven Thomson after the midfielder had been found by Michael Higdon's cut-back.

BBC: St Mirren 0-1 Rangers

The visitors almost broke the deadlock when Higdon's header from Steven Thomson's cross was cleared off the line by Charlie Mulgrew.

BBC: Steve MacLean and Zander Diamond celebrate

Glasgow had started brightly and O'Hare, who was a late replacement in the startling line-up for the injured Max Evans, went over the try line within the first couple of minutes following a clever dummy by Fergus Thomson.

BBC: Scarlets 32-37 Glasgow Warriors