After watching Indian Wells and Miami (so far)--it looks like the ascent of the next generation has begun. Thiem, Zverev, and Kyrgios, among others, are really starting to gain some momentum and getting wins against top players. And as for the "Big Four"? Only Nole seems to be rolling forward as before, still winning even though he hasn't played close to his top level since the Australian Open. Fed was playing well but we'll have to see how he comes back post knee surgery. Andy seems a bit off--not sure if it's the new family or what. And Rafa remains an enigma--playing well one minute and going out early the next--personally I doubt he's going to win even a Masters 500 this year, much less a slam. All in all, I think the transition that has been predicted for years has finally begun, if at a slightly glacial pace. By 2017--I think results will look very different from the status quo.