Agreed, we have to judge things objectively independently who is our fav and that's why I think that every player has a different situation. For example Roger has been many months out of the court and I understand that at 35 years old is more difficult to return and to do his best though I wouldn't be surprised if he would beat Berdych. Rafa this time has not been so long out of the court like the previous injuries and as more than you think that he has the same age as Roger (miles) I can't be more disagree, 5 years apart is a big difference and remember that after has been so many times without paying he has missed many tournaments so his body is not too overburdened like others which have played many more tournaments than him and if he is now healthy even better and that's why I think he can do well it doesn't matter his bad last two years results. And I don't say that he is going to win this AO but neither he would go out soon
In fact I never bought that miles thing. One on hand I am sure Nadal has run more miles in the court than Federer (even considering the age difference), but we do not have a miles bank from where we save or spend them. More miles simply mean, in general, more chances of injury, and that part history has shown. But, yes, Federer is five years older, period. But you have to admit he is dealing with age as good as it gets. When was the last time you saw a 35 years old dispatch a top 10 player the way he just did? And before you say anything about Berdych´s level, it wasn´t stelar, yes, but the guy made only 14 UFE. That´s quite a few for a 3 sets match.
By the way, I was plain wrong with my prediction of Federer losing. But I do not want to be plain wrong two times in a row, so come on, Zverev, do something about it.