You can be stubborn and successful or you can give it up a bit and change things around. For me it's important to have a bit of both.
Roger FedererMy favorite shot is always gonna be the forehand. It used to always be my favorite shot when I was young, so it's the one I've won all the points with.
Roger FedererWhen you do something best in life, you don't really want to give that up - and for me it's tennis.
Roger Federer