Inverness Caley Thistle are top of the Scottish Premiership after beating Motherwell 2-0 at Fir Park.
Greg Tansey opened the scoring just before half-time and substitute Aaron Doran sealed the points for John Hughes' side late on.
Celtic unfurled the flag for winning last season's title then thrashed Dundee United 6-1. Jason Denayer, Kris Commons, Stefan Johansen and Anthony Stokes were on target before Jo Inge Berget added a double. John Rankin scored for the visitors.
Darian MacKinnon was the matchwinner as Hamilton Accies beat St Johnstone 1-0 at New Douglas Park to claim their second win in four days.
Kilmarnock won 2-1 away to Ross County thanks to goals from Josh Magennis and Tope Obadeyi. Liam Boyce pulled one back for the Staggies.
Dundee and Partick Thistle drew 1-1 at Dens Park. Gary Fraser had the Jags ahead early on but teenager Craig Wighton equalised. Thistle had keeper Scott Fox sent off and Paul Gallacher saved a penalty to earn Alan Archibald's men a point.
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