The first Old Firm derby showdown of the new season takes centre stage in the Scottish Premiership this weekend, with the stakes already high at Ibrox. Russell Martin gets his first taste of one of world football’s fiercest rivalries and will hope it doesn’t prove to be his last with massive scrutiny already building on his position as Rangers boss after a dire start to the campaign that has seen them win none of their first three league games in addition to being humiliated 9-1 on aggregate by Club Brugge in Champions League qualifying.