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Best of BP: 1,000 Grounders: What We Still Don't Know About First Base Defense - Baseball ProspectusBaseball Prospectus
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What is the rule on a runner who runs through 1st base and steps into fair territory, but then runs outside the base line?
FIRST BASE | English meaning - Cambridge Dictionary
First Baseman | Glossary | MLB.com
Infield in, No Doubles, and other First Base Positioning
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