@wright said:
What about Pete without his serve? He wouldn't have been able to keep the 6 year end #1's.
Well, probably Pete without his ...anything wouldn't be able to be anywhere near the player he was. If you take away his serve, he's top 10 with maybe a slam or two. If you take away his forehand, he might have gotten a couple of Slams, maybe a world #1 rank, but not in contention for GOAT. If you take away his volleys, he doesn't have anywhere near as many Wimbledons/USopens, and isn't anywhere near GOAT contention.
Really, it's SO difficult to be at the top, that if you take away any single positive attribute of a top player, he's no longer going to be able to stay at that top spot. Some players really do have "crutch" shots - the serve for Karlovic, maybe Arthurs - but for most, you shouldn't look at it like that.
For example, Ivanisevic. True, his serve was his main weapon. But his volleys were also competent, and he was a good shotmaker from the baseline too. Of COURSE if you take away his best shot, he wouldn't be the player he is; but he'd still be in the top 100.
...also, some of those listed are kind of ridiculous, once you think about them. "Rafter without his volleys?" That's like saying "Agassi without his groundstrokes." Actually, that works for just about any of the current top players. Hey, if you take away their groundstrokes, they're gone!
Also related is the question of "if you take away the shot... what do your replace it with?" For example, if you take away Ferrero's forehand and replace it with a forehand that's about average for the ATP top 100 - he'd still be the player he is. The "average" forehand of the ATP top 100 is damn good - it would still be a strength for Ferrero, though maybe not as much of a strength as it is now. He'd still be in contention for Grand Slam titles because of his backhand, his speed, all his other attributes.