I think we all agree that tennis needs a great change. New rackets and strings killed tennis on grass and on hard courts. There are average players who only can serve 240km/h and play volleys and who are or were in top 20 ATP. Cilic, Isner, Raonic, Anderson, Querey....Now real tennis is played only on clay courts. In US and in Australia there is a great crisis. For 15 years there was no great player from these countries. We cant be surprised because they play on had courts so they can only serve and play volleys. They play primitive tennis without topspin forehand and backhand. When the best players fight with 2 meters high great servers random breakes decide who wins. Something must be done to save tennis. Maybe only one serve should be allowed. Maybe on fast surfaces they should play using different balls slowing the game. What do you think ?