保送率

保送率（BB/9，Walks per Nine Innings）是一种棒球术语，指投手平均每9场球所投出来的保送。投手可能因为四坏球保送、故意四坏球保送、触身球保送三种而使打者上垒。此数值关系到投手的控球精准度。 $\ BB/9={\frac {BB+IBB+HBP\times 9}{IP}}$

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