Kilmarnock scored her first win in Tynecastle in five years, with Ross Millen scoring the only goal to beat Hearts 1-0. Steve Clarke's team had spent most of the second half on the back foot before Millen had found the net in the 73rd minute. Hearts, who will now be ousted for the first time this season by the Scottish Premiership Summit, if Celtic would win at least one point in Livingston on Sunday, had looked lively but struggled to create clear chances.
The game started at a great pace and both teams maintained this intensity for the remaining half. The guests wereted a great opportunity to take the lead within two minutes, just seconds after Hearts winger Callum Morrison headed into the area under the challenge of Mikael Ndjoli.
After referee Don Robertson waved the game further, Killie broke and Aaron Tshibola prevailed Chris Burke, but the winger was blocked by Hearts keeper Zdenek Zlamal.
The team of Craig Levein had plenty of possession during the early transfer, but had to wait until the 11th minute for the first sight of the opponent, with captain Peter Haring had a 25 -meter volley just before the target.
Kilmarnock midfielder Alan Power shot directly from Zimbabels on Zlamal.
A fine move the Hearts striker had developed. Steven MacLean opened the scoring in the 20th minute, but the striker had no chance. MacLean initially twisted Michael Smith's pass and received a return from Arnaud Djoum before his low cross failed.
Hearts striker Craig Wighton then managed to make room before a left foot crashed into the side net.
The rugby park outfit continued to look dangerous during the break and a strong Ndjoli shot ended with a long-range shot from the midfield player.
Hearts got his best shot from half a minute before the break when Djoum Ben Garuccio was in the box, but the effort left out from an angle was well saved by Daniel Bachmann.
The Kilmarnock captain, Kris Boyd, was only a few inches away when he led the Ayrshire side on 50 minutes with a free kick from 20 meters to the top.
Hearts spent most of the second half, battling sensible openings against a well-trained Kilmarnock team. Defender Jimmy Dunne went from one corner to the roof of the net before MacLean had to cancel a goal for offside.
After Killie had absorbed the pressure, he stormed in the 73rd minute by Millen. Burke set up the right-wing outer section at the edge of the compound, and Millen's well-judged draft under Zlamal. Kilmarnock took the first league victory in four games.