This one is interesting. For me personally as a Murray fan, I go into their matches thinking the outcome depends solely on how Federer plays.
This is possibly the first time I feel it depends on Murray. Murray has taken pace off his serve and been slicing it and making a higher percentage. He hasn't been striking the ball very well, but he started to show signs of improvement against Chardy.
If he puts it together, I fancy him for this one. Anything less and Federer should come out on top.