Kilmarnock have pegged back Celtic at half time at Rugby Park as Josh Magennis's goal on the stroke of half time cancelled out Leigh Griffiths's opener.
It was a dream start for the visitors as Kris Commons sent Griffiths clear of the Kilmarnock backline and the striker calmly slotted the ball beyond Jamie MacDonald inside the opening two minutes.
Virgil van Dijk, Commons and Griffiths all tested MacDonald with further early efforts as Celtic took the game to the Scottish Premiership's bottom side.
James Forrest then whipped a dangerous ball into the box that was diverted goalwards by Griffiths, only for MacDonald to claw it away at full stretch.
However, Killie threatened too, and levelled the game with virtually the last kick of the half when Magennis fired home.