Can anyone who has been watching a lot of JMDP recently tell me as to whether his backhand has come to full strength or is he mostly slicing. If it is the later case, Fed should continuously attack his backhand (like an island boy did to Maestero himself) and at the same time hit to forehand once in a while to keep him honest.
I have watched a couple of hours of del Potro playing in the last weeks, even if not so many full matches as I would have liked (1.5 I guess), as highlights can be quite misleading (and long highlights from his matches I guess I have seen from all).
He is playing the best tennis he played in years, surely quite better than last year. Not 2009 level, sure, but he is on a constant evolution. If he is able to keep this pace of improvement, by USO time he will be one of the guys to
really look for.
About the back hand, he still slices more than the average player, but part of this is now intentional. He can engage in rallies just driving it, and he can hit them quite hard again sometimes. There is still a limitation there, but now I would say is marginal. The quality of the slice increased as one would expect. On a different note he added the drop shot to his arsenal, but I guess he won't use much against a good defender as Federer (he used tons of it against KA in Acapulco).
The thing about the strategy you mentioned is that most players are doing this -- and as you see he has answers to it now. The strategy in itself I would say is inefficient, even if Federer would be the best guy to try it, as he has probably the best slice backhand on tour and could engage in those exchange for hours, being able to rip a winner from the bh side if the opportunity arises. But I do not think he will.
I think he will try to keep the match on a quick pace -- as del Potro is apparently struggling a bit with movement, and will use a combination of hitting hard and deep down the middle with sudden angles and variations of pace. He will also try to lure del Potro to the net.
Federer is now a much better strategist than he has ever been, but I do not think he can survive another display of UFE's as he did yesterday. Nothing would surprise me in this match, blowouts either side, a nervous competitive one as Federer's semi or a classic. In other words, I can jive all I want, fact is that I don't have a clue...