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| Progressive Innings Pitched 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 | IP | Single-Season | IP | Active | IP | Yearly | IP |
| 1947 | Domingo Contreras | 288.3 | Domingo Contreras | 288.3 | Domingo Contreras | 288.3 | Domingo Contreras | 288.3 |
| 1948 | Domingo Contreras | 566.7 | Domingo Contreras | 288.3 | Domingo Contreras | 566.7 | Stephen McMaster | 281.7 |
| 1949 | Domingo Contreras | 847.7 | Domingo Contreras | 288.3 | Domingo Contreras | 847.7 | Tommie Guernsey | 283.7 |
| 1950 | Joseph Hale | 1103.0 | Ryan Canizales | 321.7 | Joseph Hale | 1103.0 | Ryan Canizales | 321.7 |
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