Hamilton Accies are six points clear at the top of the Development League after beating St Mirren 2-1 in Renfrew on Monday.
Ryan Tierney and Steven Boyd (pictured) scored in the first half for the visitors, with Cammy Howieson reducing the deficit after the break.
Celtic, who have five games in hand, are up to second place thanks to a 1-0 win over St Johnstone at the Excelsior Stadium. Nadir Ciftci got the only goal early in the second half.
Aberdeen are third after beating Kilmarnock 2-0 at Rugby Park thanks to first-half goals from Craig Storie and Scott Wright.
Motherwell defeated Partick Thistle 2-0 at the Excelsior Stadium, with Allan Campbell and Ross MacLean netting before the break.
Hearts racked up a 3-0 win over Dundee at Ochilview. Robbie Buchanan, Dario Zanatta and Angus Beith got their goals.
David Hopkirk and Mikael Antoine-Curier were on target as Dunfermline beat Ross County 2-0 at East End Park.
The games between Dundee United and Hibernian and Inverness CT and Falkirk were postponed.
Raith Rovers closed the gap on Development League East leaders Stirling Albion - who host Cowdenbeath on Thursday - by beating East Stirlingshire 3-1.
Morton are a point ahead of Ayr United in the Development League West following a 4-0 win away to Stranraer.