Dimitrov is sideways with the body in perfect balance, eyes on the ball, arms start to separate.  The racquet head is alligned behind the ball.  The wrist is up and the hitting arm is almost straight.

As the ball gets closer, both arms move in opposite direction but remain about the same height to keep the shoulders level. Dimitrov swings straight at the ball

Right before contact Dimitrov's racquet continues moving forwards.  The racquet head is way above the arm.  The legs are wide appart as he transfers his weight towards the front foot. 

Perfect contact, slightly in front of the right shoulder with the arm basically straight and the racquet head almost parallel to the net.

After contact , the racquet head remains stable as it pushes the ball forwards.  The weight is now on the front foot.

As the arm moves forward, the racquet head starts to open.  The wrist remained firm and the body remained sideways thoughout the whole swing - a perfect execution of a high backhand volley

Player: Grigor Dimitrov | Tournament: Mutua Madrid Open