The base runner in baseball refers to a member of the offense team whose job it is to clear all four bases to be able to score a run. Once a player has hit first base, they are considered a base runner as they are now on base. To score a run, the base runner needs to pass the first base, second base, third base and home plate. When passing these bases, the base runner needs to make contact with them.
A batter can become a base runner when one of the following happens:
- They hit a ball into fair territory that isn’t putout.
- The defense team commits an error, which allows the batter to proceed.
- They are hit by a pitch.
- They are awarded a base on balls.
- The third strike goes uncaught.
- A fielder interferes with the batter.
A base runner stops being a runner when one of the following occurs:
- They score a run.
- They are put out in any way.
A teammate is put out for the third time in one inning.