If a runner is obstructed while advancing to second base due to a fielder blocking the base before having the ball, what is the outcome?

The correct outcome for a runner who is obstructed while advancing to second base because a fielder is blocking the base prior to possessing the ball is that the runner is awarded second base. This decision is in accordance with the rules of obstruction which state that a runner is entitled to advance when they are impeded by a fielder who does not have the ball. The purpose of this rule is to ensure that players can have a fair chance to advance without unfair interference.

When obstruction occurs, the runner is protected, and the umpire is expected to award them the base they were attempting to reach at the time of the obstruction. This emphasizes the importance of a fielder needing to play the ball without causing interference with a runner's path to the base. In this scenario, the runner's right to safely reach second base takes precedence over any defensive actions taken by the fielder.