There is more then just playing tennis to get there, practice is great but dont over do it
Winners don't concern themselves with exhaustion.
Then take a ten to fifteen minute break in between, drink a lot of water, and stretch. Stretching out first and during is the most important thing.
Good. Then push yourself as far as you can!
That'd be too much on your body. I suggest 8 hours a week. Spread it out and you'll be fine. Gotta treat the body good.
Hm. Maybe do a bit more than you already do but do things that will help your skills off the court. You don't want tennis elbow! You could do stretches or work outs that would help.
Idk what to tell ya, man. It just sounds like a lot to me.
I just think taking care of your body is more important than a sport you'll someday be too broken to play.