| Most Unearned Runs Allowed | |||||||
|---|---|---|---|---|---|---|---|
| Player | Team | Year | Age | IP | R | ER | UER |
| Tyrone Rogowski | MON | 2029 | 30 | 189.1 | 135 | 108 | 27 |
| Thomas Holtzclaw | HAV | 2024 | 34 | 84.2 | 68 | 42 | 26 |
| Curtis Chiesa | OZA | 2031 | 29 | 185.1 | 119 | 93 | 26 |
| James Endres | ATL | 2026 | 27 | 312.2 | 133 | 107 | 26 |
| Pedro Castro | AM | 2027 | 29 | 225.1 | 115 | 89 | 26 |
| David Mitchell | MM,MXC | 2037 | 30 | 222.0 | 126 | 100 | 26 |
| Kevin Goetsch | MON | 2024 | 28 | 228.0 | 127 | 103 | 24 |
| Terry Cowles | MON | 2025 | 37 | 186.0 | 159 | 135 | 24 |
| Fernando Aguilar | VER | 2032 | 25 | 254.2 | 125 | 101 | 24 |
| José Cordero | SJ | 2033 | 27 | 195.0 | 85 | 61 | 24 |
| Miguel Castillo | LAR | 2039 | 33 | 251.1 | 137 | 113 | 24 |
| Pete Bathgate | MM | 2061 | 32 | 198.0 | 96 | 72 | 24 |
| Tucker Hayes | ORR | 2067 | 31 | 189.0 | 126 | 102 | 24 |
| Liu-chun Zhang | PHI | 2059 | 29 | 187.0 | 142 | 118 | 24 |
| Kevin Goetsch | MON | 2025 | 29 | 206.2 | 139 | 116 | 23 |
| Luis Cerda | MM | 2030 | 28 | 202.0 | 103 | 80 | 23 |
| Richard Usrey | ORR | 2032 | 35 | 202.0 | 107 | 84 | 23 |
| Joan Southwood | CC | 2024 | 26 | 164.1 | 119 | 97 | 22 |
| Yoshitomo Okakura | VER,MON | 2028 | 23 | 182.1 | 106 | 84 | 22 |
| Pedro Amaya | VER | 2035 | 29 | 164.1 | 110 | 88 | 22 |