I don't think Fonseca is quite up there just yet. Hope I am wrong, but untill he actually gets there, there's absolutely no guarantee that he will...
Having said that, there is one complicating factor in his case. Of all those players mentioned in the recent posts, Fonseca is by far the more aggressive one. And, to put it bluntly, it is simply more difficult and less effective to play like that. This means that everything is up to you. And if you are an 18 years old just finding out what it is like to be in a big court in the later stages of a big event, that responsibility seems like an impossible burden.
Of course that this is difficult for anyone, but less aggressive players will always have the option to just put everything back in play without changing completely his approach to the game, even if for just a few points, here and there. Fonseca does not have that luxury, and he knows that.
Actually, that is exactly what got him in the Draper match in IW. Fonseca was killing Draper in the first, the Brit simply was struggling massively just to deal with the pace of Fonseca's shots. But then a string of would be winners landed out for millimeters (I guess in five straight points), and that was it.