Share 'Post thoughts on the ATP World Tour Finals: the value of defensive tennis and will American tennis ever break into the top 4, WTA or ATP?'

     Tennis has gone from winning points to conserving points. But that's what is to be expected with better racquets. To be able to stay in the point longer. Sampras used to win a quick easy points with a big serve, serve and volley, or down the line screamer with his running forehand.      And Federer is partly of this school. He hits a well placed serve and then tries to get an advantage off…