Home runs per nine innings

In baseball statistics, home runs allowed per 9 innings pitched (HR/9IP or HR/9) or home runs allowed per nine innings (denoted by HR/9) is the average number of home runs given up by a pitcher per nine innings pitched. It is determined by multiplying the number of home runs allowed by nine and dividing by the number of innings pitched.[1] Pitchers with high fly ball rates are more likely than pitchers with high ground ball rates to have high HR/9 rates.[1]

Leaders

The career leaders in HR/9IP through 2018 were Jim Devlin (0.0448), Al Spalding (0.0468), and Reb Russell (0.0488).[2]

There were 87 single-season leaders in HR/9IP through 2018 who had pitched a season without giving up a home run.[3] All played prior to 1927.[3]

The active leaders in HR/9IP through 2018 were Clayton Kershaw (0.6225), Adam Wainwright (0.6755), and Charlie Morton (0.7682).[4]

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References
  1. What is a Home Runs Per Nine Innings (HR/9)? | Glossary | MLB.com
  2. Career Leaders &amp Records for Home Runs per 9 IP | Baseball-Reference.com
  3. Single-Season Leaders &amp Records for Home Runs per 9 IP | Baseball-Reference.com
  4. Active Leaders &amp Records for Home Runs per 9 IP | Baseball-Reference.com
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