Supersub Stevie May ensured St Johnstone got the first home win of the season that they thoroughly deserved.
The striker slid in at the near post in the 72nd minute to finish off a Craig Conway cross from the left.
It would have been a travesty if Saints had been denied victory.
They dominated this contest from virtually the first minute to the last.
The opening period in particular was as one-sided a match as you could wish to see.
The shot count was 14-0 in the Perth side’s favour in that half.
Scott Tanser and Callum Hendry were guilty of missing from close range but there were plenty of other near things.
It took until the 80th minute until St Mirren had a shot on target but the hosts saw the game out with little panic.
