Defining the Walk Off Grand Slam A walk off grand slam occurs when the home team takes the lead in the bottom of the ninth inning (or any extra inning) via a four-run hit or error, with the bases already loaded. Documented Instances in MLB History Major League Baseball maintains a definitive list of these rare occurrences, with the first verified instance taking place in the modern era in 1993.
Complete List of Walk-Off Grand Slams in MLB History and Total Count
The combination of a full count of runners and a pitcher walking in the decisive moment creates a mathematical probability that remains almost never realized outside of theory. The Mechanics of a Walk Off The conditions required for this specific achievement are precise and unforgiving.
Under these circumstances, a walk issued by the pitcher results in the go-ahead run scoring automatically, securing a 4-0 victory in runs batted in for the visiting team's batters. A team must be losing or tied in the final half of the ninth inning, the home team must possess the lead, and the batting team must have a runner on first, second, and third with less than two outs.
MLB Walk-Off Grand Slams: Complete Historical Count and Statistics
This specific sequence eliminates the possibility of a defensive play, placing the outcome entirely on the pitcher and catcher. The term "walk off" signifies the game ending immediately upon the scoring play, allowing the home team to walk off the field in victory.
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