Eight teams are now just 90 minutes from Hampden - and the first two battle it out on Tuesday.
Hearts were sent spinning out of the League Cup by Kilmarnock last season and Steven Naismith will be desperate to avoid history repeating itself with a place at Hampden on the line.
The teams have already battled out a goalless draw at Tynecastle in the Scottish Premiership this season but it's winner takes all in Ayrshire. Hearts haven't won this trophy since 1962 and their opponents in the final were Kilmarnock. It's been a long time for a club of their size and fans will be hoping they can end the wait this season. But how can you keep up with the game? Record Sport takes a look.
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