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- At any time, the team at bat may use courtesy runners for the pitcher and/or the catcher.
- The same individual runner may not be used for both positions (pitcher and catcher) during the game.
- Neither the pitcher nor the catcher will be required to leave the game under such circumstances.
- Players who have participated in the game in any other capacity are ineligible to serve as courtesy runners.
- A player may not run as a courtesy runner for the pitcher or the catcher and then be used as a substitute for another player in that half inning. If an injury, illness or ejection occurs and no other runners are available, the courtesy runner may be used as a substitute.
- The umpire-in-chief shall record courtesy runner participation and also announce it to the scorer.
- A player who violates the courtesy-runner rule is considered to be an illegal substitute.
- Should an injury, illness or ejection occur to the courtesy runner, another courtesy runner for the pitcher or catcher may run.
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