Someone asked for an analysis of your serve even though you already did one. So here are my thoughts:
Compared to ZPTennis, your power sources are a bit different. One obvious thing, is the difference in knee bend. Also, Drak has a good shoulder drop meaning the right shoulder is lower than the left. I don't see as much shoulder stretch in Drak's serve. The rotation and uncoiling could use a little work. The shoulder rotation isn't as complete, but it's still there for sure. At contact, he leans to the left a little. His contact point could be a little higher too. He needs to get a straight line from his racket tip, down his arm, to his leg so that he can get maximal transfer of energy. I'm not sure if this makes too much of a difference, but I noticed his elbow doesn't point to the sky during his backscratch.
This is almost text book.
1. Tossing arm straight.
2. Knee bend.
3. Hips in the court.
4. Trophy pose.
5. Racquet back
6. Complete racquet drop.
7. Racquet coming at ball on it's side.
8. Pronation.
9. etc.
By the way, that serve was a few inches long, not 2 feet. It just looks that way because of the speed and camera angle.
I am a 4.5 player, and could be 5.0+ if I went out on the court and hit more than the 4-5 times a month I play now. I just don't have the time anymore.
You are absolutely dreaming if you think you have seen 3.5 or 4.0 players with technique as solid as mine. Hell, there are 4.5-5.0 players that don't have as good technique. I have been playing since I was 9, and played competitively until 19 (including a college that won the National Championship the year before I got there). I just took it up again 2 years ago after a 14 year layoff.
PS: On all these videos I am serving with a bruise on the arch of my left foot, which prohibits me from launching into the court. The only reason I originally posted my service video was because people were skeptical I could not hit 100. So I did it any ways without the aid of my left foot.[/QUOTE]