Melrose v Currie and Gala v Ayr will settle the fate of the Scottish Premiership. Gala are two points ahead going into the final round of games but the title could well be decided on the bonus point situation on the final day.
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Christian Pay's family say he was "loved by all" and had "the heart of a lion". The 18-year-old died after falling ill at the festival.
The first of seven races will begin at 5:45pm, and 76 horses are competing. The UK's top female jockey is amongst the competitors.