| Most Unearned Runs Allowed | |||||||
|---|---|---|---|---|---|---|---|
| Player | Team | Year | Age | IP | R | ER | UER |
| Jesús Cantú | RLH | 2017 | 28 | 182.2 | 130 | 101 | 29 |
| Enrique Valle | WIZ | 2034 | 25 | 123.0 | 109 | 88 | 21 |
| Tom Scots | CHS | 2046 | 35 | 129.2 | 89 | 70 | 19 |
| Tyler Carter | MON | 2028 | 22 | 100.2 | 145 | 126 | 19 |
| Jeff Territt | P'76 | 2022 | 25 | 139.0 | 73 | 54 | 19 |
| José Alaniz | LS,LBC | 2019 | 23 | 155.2 | 90 | 71 | 19 |
| Greg White | KT | 2020 | 23 | 148.0 | 67 | 48 | 19 |
| Javier Tares | NA | 2016 | 27 | 118.2 | 69 | 51 | 18 |
| Guillermo García | LBC | 2017 | 35 | 160.2 | 61 | 43 | 18 |
| Dave McAlear | BUF | 2045 | 35 | 109.2 | 80 | 62 | 18 |
| Lou Hartling | NV | 2025 | 27 | 149.2 | 98 | 80 | 18 |
| Germán Rodríguez | BUC | 2024 | 21 | 122.2 | 82 | 64 | 18 |
| Rex Hood | SEA | 2023 | 23 | 125.0 | 80 | 62 | 18 |
| Elvin Brooks | MON | 2028 | 32 | 97.2 | 96 | 79 | 17 |
| Leroy Picot | PORT | 2027 | 30 | 118.2 | 72 | 56 | 16 |
| Bhagavan Antle | FTW | 2046 | 25 | 138.1 | 76 | 60 | 16 |
| Juan Júlio | LBC | 2017 | 29 | 176.1 | 72 | 56 | 16 |
| Carlos Sandoval | DET | 2050 | 22 | 107.1 | 74 | 58 | 16 |
| Robert Smalls | PORT | 2042 | 31 | 134.0 | 69 | 53 | 16 |
| Aldo Raine | LI | 2039 | 28 | 125.1 | 66 | 50 | 16 |