If he keeps playing like this it will be wrapped up in 3 sets.
Federer is playing the worst game of his life.
He's now broken his serve 3 times in a row.
I'm editing this post again, it's not Federer playing badly it's Murray playing his best ever tennis.
Epic 3rd game of the 2nd set, If Murray had lost that it would have been game on again for Federer.