Inverness, Scotland (SportsNetwork.com) - Kris Commons scored inside the opening three minutes at the Caledonian Stadium on Sunday to help Celtic get a 1-0 win over Inverness.

The Hoops wasted no time in opening the scoring as Commons played a quick give-and-go with Georgios Samaras before firing a low shot past Dean Brill in the Inverness net.

It proved to be all Celtic would need to collect all three points as Fraser Forster kept a clean sheet for the remaining 87 minutes to guide Neil Lennon's side to its 15th Scottish Premier League win of the season.

Celtic, still unbeaten through 18 league games, stays atop the table by improving to 48 points, moving the club 15 points clear of Inverness.

Steve May helped St. Johnstone snap a four-game winless run on Sunday, bagging a hat trick to lead his side to a 3-0 defeat of 10-man Dundee United.

May seized control of the match after Calum Butcher was sent off after 20 minutes as the St. Johnstone striker scored from the spot to give his side a narrow lead heading into the halftime interval. He added goals in the 57th and 87th minutes to put the result beyond any doubt.

Motherwell claimed its fourth successive win in emphatic fashion on Sunday, getting a 5-1 win at Partick Thistle to improve to 37 points, and Hibernian earned a 3-0 win over Kilmarnock to get its second straight league victory.

Also on Sunday, Nicky Lowrie scored in the second minute of Aberdeen's 1-0 defeat of Ross County while Hearts earned a point from a 1-1 draw at St. Mirren.