Who or what will be the next big revolution in tennis? IMO Lendl revolutionized the game in terms of fitness, dedication and introducing more of a power game. I believe he was the first to change rackets with new balls. Poor guy doesn't get enough credit IMO! In the future I think tennis is likely to experiment with new balls. Or I wonder if their will be some kind of racquet or stringing restrictions. Kinda like formula 1 and engine restrictions!