Hearts are two points clear at the top of the Ladbrokes Premiership after beating Motherwell 2-0 at Tynecastle on Wednesday evening.
Gavin Reilly gave Robbie Neilson's men the lead with a first-half penalty and Billy King sealed the victory in 64 minutes as Hearts made it three wins out of three.
Kilmarnock twice hit back to claim a 2-2 draw against Celtic at Rugby Park as the champions paid the price for a number of missed chances.
Leigh Griffiths' early opener was cancelled out by Josh Magennis just before half-time but Nir Bitton restored Celtic's lead with a stunning 30-yarder.
Kallum Higginbotham equalised in the closing minutes, coolly chipping a penalty kick down the middle to earn Killie their first point of 2015/16.
Inverness CT and Partick Thistle drew 0-0 at the Tulloch Caledonian Stadium.
