Nice find. In there is the only video I've ever seen of Berger serve. It's just one serve versus Becker, btw, because it started raining. I served the Berger way for a few weeks in the summer because of temporary injuries and it worked fine. It helped me focus more on the ball toss since the hitting arm is already set. You might lose a little maximum possible serve speed but not much. You gain serve reliability I think. Heck, I may go back to it.