Inconsistent? 3 QFs and a 4th RD appearance at the slams this year is inconsistent? The only real issue for Del Potro, is comically Ferrer. Yes, Murray and Djokovic will cause problems for him in the long run as their games force Del Potro to be unrelenting which can be tough when he is lacking confidence, but he has shown when a match is on the line he can beat anyone. There is on doubt a draw like the USO 2009 will open up, and with all these big hitters some days they just catch fire and there is nothing a player can do. Just like with Novak, Andy, Roger and Rafa he just needs a little fortune to play on his side first.
that will not bring him #1 ranking,3 major QF and 4th round appearance, not good enough ... he hasn't win anything since his maiden slam. I'm just being objective. the top 4 are regularly reaching semis and finals at slams and masters. DP does not. even if he wins another major, but can't go deep or win masters he'll never become #1. it's very simple. he is not as consistent as Nole, Fed, Rafa or Murray. he doesn't have any results to show.