Controversial ex-Rangers star Steven Naismith has been sacked from his role as manager of Scottish Premiership strugglers Hearts. The 38-year-old former Scotland international has been relieved of his duties at Tynecastle following a run of eight straight defeats this season. Pressure had been mounting on Steven Naismith after Hearts were beaten 2-1 by St Mirren in Paisley in a result which ultimately proved the final straw for the Gorgie board. Hearts’ only point of the season to date came in the 0-0 opening day Scottish Premiership draw with Rangers at Tynecastle. The result – in tandem with…