He's got to get past Berdych first, which may be tricky.
On last nights match, Murray has a way of finding the answer when he's in trouble, but he's not playing at his best which he'll probably need to do, but this is his big chance.
The overall career head to head record is 8-6 to Djokovic, 5 of Murray's wins have come on hard courts, 1 on grass (his olympic sf win).
Djokovic is 6-5 up on hard courts, so its pretty close. In sets won its 14-13 to Djokovic on the hard court (that includes 1 match that Djokovic retired hurt in). The key thing is Murray has never beaten Djokovic in a 5 set match on hard courts, their two previous meetings have seen Novak run out the winner, 3 sets to love in the Australian Open Final in 2011 and 3 sets to 2 in the Australian Open Semi Final earlier this year.
If they do meet I am sure Andy will be full of confidence, when he's on top of his game at the moment he's almost unstoppable, as the Olympic Games showed. He needs to keep that level of intensity up over the semi and final and not give either give his opponents head starts like he gave Cilic. Murray is the perfect example of a Jekyll and Hyde tennis player.