Home run
In the early days of Major League Baseball, a home run was not awarded to a ball hit over the fence to win the game if the winning run scored before the batter-runner were to reach home plate to score.  Therefore, what would otherwise be walk-off home runs were not commonplace, and players were often robbed of home runs.  Due to this, for instance, Babe Ruth is not credited with a particular walk-off home run that would bring his career total to 715.