This clip is a great view of where the ball is tossed and how Federer opens up the court on a wide inside-out pitch that kicks into the stands. Power is not the priority here. It’s placement. And the ball clears the highest part of the net with a great bend. All of his body is used to generate this shot with seemingly effortless movement. Also, for this kind of kick he uses a slightly more exaggerated serve grip past his first serve grip to create more spin. Aiming for a target in the service box and working on a “kick right” bounce is a great way to practice this technique.