One point separates Rangers and Celtic in the Scottish Premiership, so where could Saturday's Old Firm clash be won or lost?
Michael Beale's side host their rivals knowing defeat would be a dent to their title hopes, even at this early stage of the season.
The fans will be demanding a performance after their midweek Champions League play-off disappointment away to PSV Eindhoven.
Brendan Rodgers suffered just one defeat to Rangers in the Scottish Premiership during his last spell in charge, but it has been a disappointing few weeks for Celtic with an early Viaplay Cup exit and a goalless draw against St Johnstone.
WhoScored.com picked out four potential key head-to-heads that could well determine who has bragging rights this weekend.
Jack Butland vs Joe Hart
When Allan McGregor left Rangers in the summer, there was no doubt that filling his gloves would prove a tricky task for the next Gers goalkeeper. However, you could argue that Jack Butland has perhaps been the most impressive of Michael Beale's summer signings so far.
Kilmarnock's winning goal on the opening day is the only league goal that the former England goalkeeper has conceded so far. The keeper - and defence in front of him - duly responded with clean sheets against Livingston at Ibrox and Ross County in Dingwall.
However, you'd suspect that the former Birmingham, Stoke and Crystal Palace stopper won't get quiet an afternoon on Sunday.
Only St Johnstone's Dimitar Mitov (7.78) and Will Dennis of Kilmarnock (7.30) are higher rated than the 30-year-old in the Scottish Premiership so far this season, arguably only due to both of those two goalkeepers being called into action more often.
Celtic fans are quick to criticise Joe Hart, but there was no goalkeeper that kept
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