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| Progressive Walks 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 | BB9 | Single-Season | BB9 | Active | BB9 | Yearly | BB9 |
| 1947 | Stan Lugo | 1.05 | Stan Lugo | 1.05 | ||||
| 1948 | Stan Lugo | 1.05 | Stan Lugo | 1.28 | ||||
| 1949 | Stan Lugo | 1.05 | Stan Lugo | 1.58 | ||||
| 1950 | Domingo Contreras | 1.74 | Stan Lugo | 1.05 | Domingo Contreras | 1.74 | Jose Rao | 1.40 |
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