Best way to beat Bjorn is to fight fire with fire - he will constantly try and draw you to the net, then get you with the passin shot.
So return the favor - drop shot after drop shot. Eventually instead of hitting volley he will just play a lazy shot over the net. Take your time, let your player catch up to the ball and hit it right up the line. It works almost 90% of the time.
It's a bit cheesy but it nets you a 6-0, 6-0, 6-0 win every tomez