"I haven't played over two hours really for the last few matches so, yeah, I feel fresh," Murray said.
"Hopefully that will be to my advantage going into the weekend.
"I have to play a lot of long rallies against the guys that are left in the tournament, so I'll need my legs to be fresh for the next few matches."
Djokovic believes Murray will only get stronger once he is able to spend more time with
new coach Ivan Lendl
But he is not surprised to see Murray blocking his path at Melbourne Park once again.
Of Lendl, Djokovic said: "From my perspective it's good to see a legend - one of the greatest players ever to play the game - being around the tour again.
"I don't know how much it has affected Andy. They haven't had that much time to work on things but I guess him
winning the title in Brisbane
and reaching the semi-finals here says the match is good.
"He's always been successful in Australia. He has always been very fit and committed and he proves that over and over again. I guess the effect of Lendl being part of his team will be felt in time to come."
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