Naismith struck all three of his goals in the first half while providing a lovely assist for Olly Lee.
September 1, 2018
Jimmy Dunne's own-goal was the only blot on Hearts' copybook as they recorded their fourth win from four league outings.
The win keeps Hearts top of the Scottish Premiership with four wins from four; the only side in the entire SPFL to have a 100% win record.
St Mirren remain second-bottom with three points.
September 1, 2018