From Federer's interview: Q. Across all surfaces have you noticed any sort of change since you came on the tour or not? ROGER FEDERER: I think the indoors has gotten a little slower than it used to be. I think clay's been pretty much similar because, yeah, there, I mean, I think it's similar. So maybe the hard courts also have slowed down. You don't have these American hard court tournaments which are just unplayable from the baseline, unreturnable. Everywhere you sort of get into the points. It's actually quite slow now. I think that's definitely slowed down.