Nice one, inventing your own definition of grinder.
Ferrer is a grinder. Possibly Djokovic also. Federer is not.
Federer is grinder too. But your fed fans wont admit that. How he wins points when he receives his serve than if not with grinding ?
He attacks serve from the first ball or what ?
No he just tries to keep ball as long as possible in the court , and waits for slower and shorter balls to attack.
Pusher , on other side doesnt have offensive game and he just tries to put ball back into game without trying to hit winners .