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| Progressive Strikeouts per 9IP Leaderboard | |
| This table is a snapshot of the career, single-season, active, and yearly leaders at the end of each season. | |
| * - Indicates Hall of Fame
Bold - Indicates active player |
| Year | Career | K9 | Single-Season | K9 | Active | K9 | Yearly | K9 |
| 2009 | Michael Arnett | 11.32 | Michael Arnett | 11.32 | ||||
| 2010 | Michael Arnett | 11.32 | Bobby Grimes | 11.13 | ||||
| 2011 | Ronald Koenig | 11.42 | Ronald Koenig | 11.42 | ||||
| 2012 | James Sousa | 9.93 | Deangelo Ceja | 11.47 | James Sousa | 9.93 | Deangelo Ceja | 11.47 |
| 2013 | Miles Farrelly | 10.57 | Deangelo Ceja | 12.60 | Miles Farrelly | 10.57 | Deangelo Ceja | 12.60 |
| 2014 | Ronald Koenig | 10.96 | Deangelo Ceja | 12.60 | Ronald Koenig | 10.96 | Danial Hayes | 12.32 |
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