| Most Unearned Runs Allowed | |||||||
|---|---|---|---|---|---|---|---|
| Player | Team | Year | Age | IP | R | ER | UER |
| Jerome Middlebrooks | SYR | 1981 | 28 | 200.2 | 126 | 96 | 30 |
| Judson Gill | PAW | 1984 | 27 | 185.0 | 143 | 113 | 30 |
| Doroteo Coto | PIT | 1978 | 33 | 222.2 | 141 | 112 | 29 |
| Dave Crudge | BAL,NO | 2010 | 31 | 196.1 | 101 | 74 | 27 |
| Sixto Berru | CAL | 1979 | 25 | 103.2 | 99 | 73 | 26 |
| Jerome Middlebrooks | SYR | 1984 | 31 | 237.2 | 119 | 93 | 26 |
| Víctor Rodríguez | PAW | 1989 | 24 | 194.0 | 133 | 107 | 26 |
| Manuel Puerias | MIS | 1990 | 34 | 201.1 | 130 | 105 | 25 |
| Art Casey | DAL | 1993 | 27 | 155.2 | 122 | 97 | 25 |
| Len Jenkins | HYU | 1989 | 24 | 181.2 | 120 | 95 | 25 |
| Wes Perry | LAD | 2031 | 32 | 184.0 | 126 | 101 | 25 |
| Mark Cashan | SYR | 1980 | 26 | 198.2 | 123 | 99 | 24 |
| Gervasio Dealba | LOS | 1988 | 33 | 180.2 | 121 | 97 | 24 |
| Samuel Fei | DAL | 1982 | 29 | 145.0 | 109 | 85 | 24 |
| Jayson McQueen | PHI | 1997 | 34 | 156.1 | 94 | 70 | 24 |
| Zion Jackson | PAW | 2032 | 31 | 204.1 | 105 | 81 | 24 |
| D.T. Fitts | CAL | 1983 | 29 | 176.2 | 92 | 69 | 23 |
| Migdônio Manhos | PHI | 1997 | 23 | 188.2 | 91 | 68 | 23 |
| Heriberto Melendez | LOS | 2003 | 31 | 212.0 | 110 | 87 | 23 |
| Joe Orozco | PAW | 1984 | 29 | 203.1 | 108 | 86 | 22 |