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Andrew Luck stunned the NFL world by announcing his retirement in the middle of the preseason. He has been bothered by an ankle/calf injury throughout the summer, and was reportedly "mentally worn down," opting to walk away from the game entirely. If this is truly it for the 2012 No. 1 overall pick, Luck finishes his career with 23,671 passing yards and 171 touchdowns, the second- and third-best totals in NFL history for the first six seasons of a career.