So I'm working on developing my topspin stroke. I have an eastern grip. I've watched tons of videos of pros with eastern-ish grips and it seems to me after close observation that pros who hold eastern grips actually swing largely flat. That includes Federer. There is a small low-to-high swing plane, but it is still pretty flat. I observed that some don't even finish over the shoulder. They finish a bit to the side sometimes. Yet these guys still generate a good amount of topspin. So what I'm trying to figure out is how they do it. Is it just that since these guys have such high racquet head speed -- even though they have a minimal low-to-high swing plane -- that the racquet head speed generates enough topspin to keep the ball in play? Or is it pronation? Where maybe the racquet face is closing at the point of contact? Is it a combination of the two? During my practicing, I have been trying to have a really exaggerated low-to-high swing plane and it just isn't working. I send the ball long a lot. If I get really "whippy", I send it even longer. How do the pros with eastern grips do it? I know I'm missing some element, I'm just not sure what it is.