In 2008, Cole Hamels seemed unhittable for much of the season and the post-season. He was 24 years old in 2008 when he pitched 227.1 innings in the regular season plus 35 more in the post season. That was 63 more innings total from the previous year. His worst year of his career was 2009. Here is a link to an analysis of his 2009 year that concludes that he simply had great deal of good fortune in 2008, and a great deal of bad fortune in 2009. I think he needed a year to fully recuperate from the extra innings he pitched in 2008.