On July 9th, 2005, a recently promoted Chicago Cubs prospect by the name of Adam Greenberg was called upon by manager Dusty Baker to make his Major League debut by pinch hitting for reliever Will Ohman in the ninth inning of a game against the Florida Marlins on ESPN’s Sunday Night Baseball. The rookie saw only one pitch from reliever Valerio de los Santos, and that pitch was a 92 miles per hour fastball that hit him in the back of the head.
He was immediately removed from the game, and taken to hospital. What was first diagnosed as a mild concussion was later realized to be far more severe, as excruciating headaches and positional vertigo conspired to ensure that Greenberg would never be the player that he promised to be prior to the fateful plate appearance. Since then, he’s bounced around different levels of the Minor and Independent Leagues, but has never gotten close to acquiring an official at bat at the Major League level.