Kilmarnock came from behind to beat Ayr United 3-1 in their Scottish Cup fourth round replay.
Derby win sends Kilmarnock through
A Simon Ford double against Ayr United gave ten-man Kilmarnock their first derby win since 1994 and sealed a trip to Inverness Caledonian Thistle in the fifth round of the Scottish Cup.
Bryan Prunty controversially put the Second Division side ahead in the tenth minute of an enthralling fourth-round replay at Rugby Park when he used a hand to knock the ball past Killie keeper Alan Combe.
Ford headed the equaliser four minutes after the break and then Killie were reduced to ten men when David Fernandez clashed with Martyn Campbell over in the corner.
The red card galvanised the visitors and in the 75th minute Killie eventually forged ahead after fine play by Craig Bryson.
The Killie midfielder slalomed into the Ayr box past three defenders, and when his drive was blocked by Grindlay, Mehdi Taouil slammed the rebound in off the post.
More drama was to follow 10 minutes from time when Ford sealed the trip to Inverness in the fifth round when he glanced in a Taouil corner.
