Niall
International Coach
Understatement indeedCilic has never been the strongest mentally.
Federer's consistency in this tournament is pretty remarkable. He has a >80% win percentage against fellow top-8 players over a sample size of 15 appearances in the tournament.
Obviously he has been playing in a tough era, but do think he could have won a little more if he had more steel. When he won that US Open he was clutch as hell all throughout, the obvious highlight when against a rabidly pro Federer crowd, he handled business with no fuss whatsoever.