I'm concerned by Murray's serving at the moment. Federer will eat him alive if he continues to serve like that.
Few things you may want to think about.
1) going for percentage serves to get the first serve in was a tactic today and he had a high 80/81% FSP in sets 1 and 2
2) the shoulder issue Andy has means he's not quite getting the power on his serves at the moment, he's playing with strapping on the shoulder, but has said the shoulder is feeling better
3) Federer had the easiest, by a long mile, 4th round opponent today, and that opponent ended up injuring himself with a bad fall mid-match
4) Federer was playing 'amazing', 'imperious', etc tennis in the early rounds in both Melbourne and Paris. Didn't help him much in the end.