For the most part fantasy football owners have a deep-seated streak of pessimism stemming from a past bout of bad luck. Most have a good reason, whether it was losing a top pick like Tom Brady to a freak injury in the first game of the 2008 season, having a running back lose his job due to the meteoric rise of a teammate or simply picking a player who was not worth their draft position. So we decided to beat you to the punch (to the gut) and diagnose the worst-case scenario for the Top 25 players in the 2012 SI Fantasy Football Preview Issue, available on newsstands now. Obviously, for each player a severe, season-ending malady is the true worst-case scenario, but short of that, here are plausible circumstances that could render each superstar fantasy player a bust. This week we're covering players 1 through 10. Next week it'll be 11 through 25. Naysayers rejoice.