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Another great perspective on the technology issue. It's not only the strings, racquets and surface speeds. You can't ignore the increased size, strength and conditioning of the players. Your comments dovetail perfectly with my theory that the prototype for the modern player goes back 30 years.
Ivan Lendl. We can take this conversation all over the place, but I'm gonna try to just focus on Lendl's influence. It makes a lot of sense, if you look at it logically. Basically, Lendl was a player who did not have perfect ball striking technique or great tennis SKILL(by that era's standards). What he did have, was physical strength, good size, athleticism and great work ethic. So he became the best baseliner in tennis, by the late 80s. Even though he was a power baseliner that had relatively long strokes, his game was low risk. Based on the control he had by using the perfect blend of pace and topspin. If the game evolves over time, wouldn't players naturally get better at hitting the ball with pace and spin? Let's be honest. Is it really that far of a stretch to say that Djokovic's rally balls are basically Lendl approach shots or winners from the 80s? The difference now, is that you have to hit 10 of those shots to win the point. Instead of 1 or 2 shots like that in the 80s. Plus they do hit much harder on average.
Obviously, the 2hbh is the preferred shot these days. But based on Lendl's comfort with controlling the rallies, I think he would use the 2hbh if he played now. Just generally a higher percentage shot, with more stability and less risk.
As far as surface speeds go, YOU might be right. More variety would be more interesting for the fans and would force players to change court strategy, develop new skills or improve certain skills for each surface. But I would say the players who benefit from the homogenization of the game might want to keep things the way they are right now. If they are winning, they don't want any disruption that would force them to change and result in more losses.
I agree that Ivan Lendl is a prime example of taking conditioning to another level to gain advantage. I wasn't around when Borg was playing but by all accounts he was the pioneer of bringing physicality and fitness to the game. He outlasted everyone and is quoted as saying he was never tired on a tennis court.
The next player after Lendl that comes to mind who relied on fitness as his weapon was Jim Courier. At his peak he out muscled his opponents. Agassi stated he sought out trainers after loosing to courier to become physically stronger so he could make up ground to compete. Courier was a great player, but but no means was he a technically graceful player.
The player of this generation who raised the stakes is Rafa. He is a fantastic talent but his strength and endurance go along way to helping him beat players that are superior in terms of technique.
You can also see the top 10 players physical conditioning is superior to the remainder of the top 100.
People draw parallels to boxing when talking about tennis. This parallel has never been truer when you look at the state of the modern game. It is very physical. Not only do you have to be great technically, you have to be an elite athlete to be among the top.