Rangers could really do with winning today's Old Firm derby if they're to retain hopes of stopping rivals Celtic reclaiming the Scottish Premiership title.
The visitors to Ibrox have a nine point lead at the top of the table and are on a run of 12 straight victories in the top-flight.
Later this afternoon, Hearts can consolidate third place by beating Hibs.
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Aberdeen - in fourth - attempt to stop a run of four straight losses when they host bottom side Ross County.
Elsewhere, Kilmarnock take on St Mirren, Livingston play Motherwell and Dundee United head to St Johnstone.