Detroit rookie Justin Verlander will miss his Sunday start for what is being described as arm fatigue. This may be nothing serious, but it's something the Tigers should take seriously. Overwork at a young age has shortened the career of many promising pitchers, and Verlander is a favorite for Rookie of the Year honors at 23. He worked 130 innings between the minors and a brief debut with Detroit in 2005, undoubtedly the heaviest pitching load in his brief pitching career. This year he's on course to work roughly 200 innings, a danger zone for many young arms. For example, Cubs phenom Mark Prior pitched 234.2 innings in 2003, which includes the 23.1 frames he worked in two rounds of playoff action. Since then, he has been riddled with a variety of injuries, including arm trouble. It's impossible to confirm the workload is directly linked to injury issues, but it could very well be a contributing factor. Losing Verlander down the stretch could compromise the Tigers' playoff run, but more importantly, a heavy workload in his rookie season could compromise his career.