This player has an excellent arm position here. A slight bend in the elbow. I can see where his upper arm and lower arm meet. Things look very good except that his hand has titled the racket too far downward. Rather than the racket being parallel to the ground here, the racket is tilted about 45 degrees down to the ground. Also, his hand is about a foot and a half below the flight path of the ball. Click here to see this.