New balls in play. Maybe that will help Murray finally force a break point?
GAME FEDERER - 3-5. Signs of frustration from Murray. He leads 15-30 but puts too much into a shot to the baseline and it goes long. Murray smashes into the net and shouts out "Stupid!". He knows how big that chance was.
The positive has to be that he is now definitely challenging the Federer serve, something we couldn't say earlier on in this match.
Strange opening point. Federer seemed to be waiting for a call to say the ball was out and he just prodded the ball back. No call came and Murray smashes an unreturnable forehand to go 0-15 ahead.
SET FEDERER - 4-6. There have been some brilliant rallies in this match but that will be of little consolation to Murray who falls two sets behind after his forehand drops just long. A mountain to climb now.
GAME FEDERER - 1-1. Still no sign of a break point and Murray continues to chunter to himself.
First signs of Murray holding his back as he swivels to reach a low backhand.
These two have met 19 times before with Murray taking 11 wins and Federer 8. However, in Grand Slams Federer holds a 3-1 advantage.
Federer has reached each of the last 10 Australian Open semi finals
GAME FEDERER - 2-2. But Federer wastes no time in levelling, holding to love.
The stats back up this different looking style of play from Federer under Stefan Edberg. His shot power is down on last year but he has taken 10% more of his shots from inside the baseline compared to 2013.
Change of shirt from Murray, hopefully that does the trick. Federer puts his first serve out wide again and Murray can't get to it again.
GAME FEDERER - 3-3. Another easy hold. Murray took the second point but never really threatened.
GAME FEDERER - 4-4. Murray falls 0-40 down but a couple of great returns brings him back to 30-40, only for Federer to still deny the Brit a break point and hold again.
What an outstanding lob from Federer! Looked as if it may have bounced twice but no, he reached it and left Murray scrambling.
GAME FEDERER - 4-5. Beginning of the end? That lob proved to be the turning point as Federer set up two break points and took out the first. He is now serving for the match.
Murray having a long chat with the umpire. Is unhappy about something, possibly that Federer lob? Having seen it on the slow mo there was definitely no chance it bounced twice though.
Hold up! Murray leads 0-30 on the Federer serve!