As for the Comeback Player of the Year, it has to be, without a shadow of a doubt, World No. 11 Juan Martin del Potro of Argentina. On January 31, del Potro fell to an unheard of No. 485 ranking but slowly and quietly worked his way down and is now at the brink of reentering the Top 10. The 2009 U.S. Open champion was on a collision course with greatness but he suffered a devastating right wrist injury which kept him out of action for most of the 2010 season and as a result fell out of the rankings and into oblivion. He went from No. 4 (on April 26, 2010) to the no-man's-land 485 ranking in January 2011. But as his right wrist healed and his confidence grew, he played better and better as the 2011 season progressed.
In 2011, he won two titles (Delray Beach International Tennis Championships and the Estoril Open), compiled a 48-16 match record and made the final or semifinals in 5 other tournaments, which resulted in his assault on the rankings.
So with a healthy right wrist, a boat-load of confidence and in the shadow of the Top 10, del Potro is on course to have a spectacular 2012 season and make a return to glory like when he shocked the world by winning the 2009 U.S. Open over then-No. 1 Roger Federer.
It looks like the Argentine is back!