Inverness CT remain top of the Scottish Premiership thanks to a 1-0 win over champions Celtic in Saturday's early game.
An Eoghan O'Connell own goal after 65 minutes at the Tulloch Caledonian Stadium settled the match in favour of John Hughes' side, who are yet to concede a goal this season.
Newly-promoted Hamilton Accies are in second spot after a dramatic 2-1 victory at Firhill. Kallum Higginbotham gave Partick Thistle the lead with just five minutes left but Tony Andreu equalised and Jason Scotland struck in stoppage time.
Chris Erskine scored with four minutes remaining as Dundee United beat Ross County 2-1 at Tannadice to climb to third place. Nadir Cifti's opener was cancelled out by Jake Jervis but County are still seeking their first point.
Steven MacLean grabbed the winner with 10 minutes to go against his former club as Tommy Wright's St Johnstone defeated Aberdeen 1-0 at McDiarmid Park.
There was also a late goal in Paisley, where Peter MacDonald was on target to inflict a third straight loss on St Mirren as Dundee triumphed 1-0.
Kilmarnock saw off Motherwell 2-0 at Rugby Park with goals from Robbie Muirhead and Sammy Clingan. The visitors had Fraser Kerr sent off.
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