Man of the match Shaun Rooney scored the only goal of the game after 32 minutes at the National Stadium when he headed in a corner from Craig Conway.
This was Saints' third League Cup final appearance, having been runners-up in 1969/70 and 1998/99, and this time it was Callum Davidson's side who were celebrating, with the silverware heading to McDiarmid Park after a narrow but deserved triumph over David Martindale’s men.