String technologies had great impact at game's speed. And accuracy! That's where we could see an end to S&V era, in Agassi. Returns with bigger head and better strings were LOWER, sharper and more accurate. Tough for volleying. But in the same time it become totally unwatchable, like that 2001. Ivanisevic - Rafter final. Because of those damn racquets game become so fast and quick, that something had to be done.