What's a non-runner? A non-runner is a term commonly used in horse racing to identify when a selection that was due to run in a race has subsequently withdrawn. It can also be used across other sports to identify a selection that was due to compete in an event but subsequently did not take part. If you need any further assistance, please see our contact details here. Related articles What happens if my selection refuses to run? Bet Builder What's a moneyline bet? What's a goal line bet?