Celtic are top of the William Hill Premiership table on goal difference after beating St Mirren 3-0 in Paisley in the Sunday lunchtime game.
Callum McGregor struck early on and Reo Hatate was also on target before half-time. Alistair Johnston added the third goal with 20 minutes remaining.
Aberdeen also have a 100% record following their 2-0 victory over Kilmarnock at Pittodrie. Pape Gueye grabbed a double for the Dons, either side of a red card for Killie's Brad Lyons.
Motherwell picked up their first win, beating Heart of Midlothian 3-1 at Fir Park. Paul McGinn, Stephen O'Donnell and Tom Sparrow scored for Well, with Yutaro Oda replying.
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