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| Progressive Losses 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 | L | Single-Season | L | Active | L | Yearly | L |
| 1952 | James Leggett | 25 | James Leggett | 25 | James Leggett | 25 | James Leggett | 25 |
| 1953 | James Leggett | 44 | James Leggett | 25 | James Leggett | 44 | James Leggett | 19 |
| 1954 | James Leggett | 56 |
Brain Emmer James Leggett |
25 | James Leggett | 56 | Brain Emmer | 25 |
| 1955 | James Leggett | 64 |
Brain Emmer James Leggett |
25 | James Leggett | 64 | Avelino Canabal | 21 |
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