Originally Posted by Vertiz
Just a couple points. You want to have a high take back, the same high take back every shot (even high balls). Drop the racket as you begin you swing and step forward (power step) with your body weight into the ball (very important never to have your weight falling back). Make contact out in front of you but keep your arm/elbow close to your body. The part about opening and closing the racket is hard for me to say b/c it's not something you should be working hard to do, it is natural if the rest of your swing is there.
Your wrist should be firm before and during contact. The one hander is hard to explain because every shot is different and it takes small adjustments to hit each individual shot correctly. Keep in mind the fundamentals, keep playing & practicing and you should be able to figure out the rest with time. Good luck
Listen to this guy. He sounds like someone that can actually hit a one-handed backhand.