I always liked Nishikori's game especially for a 5'10 player.
He was born brittle unfortunately.
And competed in the most physical era in tennis history.
Blew his tires and engine out.
Raonic's serve is awesome.
Fed needed to do what he needed to do to stay relevant win and compete as the sport became more physical with longer rallies.
He has talked about this.
As he stated "Novak is the ultimate challenge".
It was not just for Nadal.