In fact, del Potro has almost become a forgotten man but he is still the only player NOT named Rafael Nadal, Roger Federer or Novak Djokovic to win a Grand Slam since 2005.
After his monumental U.S. Open win in 2009 the stars seemed to be aligning for the 22-year old Argentine but in January 2010 (after the Australian Open) he suffered the crushing right wrist injury. The injury, which required surgery, derailed the rest of his season and his promising march toward No. 1. After the surgery, del Potro would not touch a tennis racket for almost 8 months and slipped in the rankings from No. 4 all the way to No. 484 as a result of his absence, especially his absence from the U.S. Open which he was unable to defend. Currently del Potro has worked his way back to No. 89 in the world.
His comeback, which began in late September 2010, got off to a horrendous start as he was twice ousted in the first round of the 2 tournaments he attempted to play. After the disappointments he decided to call it a year and let his still-ailing wrist get some more rest.
The 2011 season started with some promise as he was able to, at least, win a match in the first tournament he played before getting ousted in the second round. At the Australian Open he had the same fate, one round and out. But apparently, his wrist was gaining strength because in the 2 tournaments (SAP Open and Cellular South Cup) following the Aussie he advanced all the way to the Semifinals.
It may come sooner than he thinks. After his Delray win, the first thing the much-appreciative del Potro did was kiss is right wrist and if he can get it back to his 2009 form, it's just a matter of time before he regains his No. 4 ranking and possibly a lot more.
And I do mean A LOT more. He is that good.