The grass was changed in 2001 to make it more durable, and probably to try to counter the huge advantage enjoyed by servers and lengthen the points a bit. It has been the same grass since then. It seems clear there is more grass left on the court by the end of the tournament now than 20 years ago.
http://205.188.238.109/time/nation/article/0,8599,1815724,00.html
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Head groundsman at the All-England Club, Eddie Seaward, says the new grass was developed because the tournament needed a plant that could withstand the wear of the modern game. Grass surfaces that could put up with lightfooted gents in trousers — like Fred Perry, the Englishman who dominated Wimbledon in the 1930s — couldn't as easily endure the exertions of, say, 6-ft.-6-in. (1.98 m) Max Mirnyi, a.k.a. the Beast from Belarus.
To test the durability of different varieties, technicians at Britain's Sports Turf Research Institute put a tennis shoe on a massive hydraulic ram and then stomped patches of turf intermittently for 13 days, mimicking the conditions of the Wimbledon fortnight. The hammer was calibrated to two different weights: that of the average female and average male pro.
"We needed a grass that could hold up for two weeks and not splinter into patches, which is what causes bad bounces," says Seaward. "That was our goal." Any change in the pattern of play, he insists, "was just a natural byproduct of being able to keep the soil firmer."
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You can argue that there are two factors contributing to the fact that there is more grass left now at the end of the tournament. One is the more resistent grass (100% rye as opposed to 70%). The other is the fact that players spend more time behind the baseline now than when s&v was much more common.
A
small factor in this shift toward the baseline game can be attributed to the fact that the courts don't play as fast. But remember that the shift to the baseline game is not unique to the Wimbledon tournament. It has happened on all tournaments and all surfaces, fast and slow, grass or not grass. You don't see more s&v at Queen's -- which supposedly didn't change the grass -- than you see at Wimbledon.
If the shift toward a baseline game is universal, you cannot attribute it to the change of grass in ONE tournament. There have to be other, more important reasons. From what I have seen, s&v is still possible, and both Federer and Nadal followed their serve to the net on a few occasions in this final with success.
I am absolutely certain that if players like Sampras, Rafter, Edberg or Ivanisevic were brought from their prime into today's game, they would still s&v on most surfaces. And they would probably be pretty succesful, especially Sampras.
Then again maybe they wouldn't if they happened to meet someone with good passing shots on a good day. After all, Sampras got passed pretty spectacularly by the likes of Safin and Hewitt at the US Open, without any conspiratorial surface change. And Agassi at Wimbledon managed to beat Becker in the quarters, McEnroe in the semis, and Ivanisevic in the final -- that's three of the best grasscourt players of all time -- to take the title from the baseline on the mythical old grass.
Maybe there is a simple explanation. Maybe players on average have become better baseliners than they used to be, and worse volleyers than they used to be. Did this change take place just because Wimbledon went from 70% rye to 100% rye in 2001? I don't think so. Wimbledon is important, but it doesn't have magical powers. The players playing today were learning the game well before the grass change at Wimbledon. Did they foresee the change when they decided to specialize in aggressive groundstrokes, to the detriment of learning how to volley? I don't think so.
To my knowledge, since the grass change in 2001, nobody said that Ivanisevic, Rafter, Philippoussis, Roddick or Federer made it to the Wimbledon finals or won the title because of the new grass, even though they did so on the new grass. This kind of nonsense began only when Nadal started making it to the finals three years ago, and now it reaches a peak because he won it. Didn't he just beat Roddick on the old grass at Queen's? Nadal had just arrived from the RG clay a few days earlier, while Roddick had been practicing on grass for several weeks. I never heard the likes of Kaptain Karl blabber inanely about the big conspiracy to help "dirtballers" at Queen's. No. That kind of inane blabber is reserved only for Wimbledon.