| Most Unearned Runs Allowed | |||||||
|---|---|---|---|---|---|---|---|
| Player | Team | Year | Age | IP | R | ER | UER |
| Gerrit Cole | ATL | 2020 | 29 | 157.0 | 87 | 71 | 16 |
| Andrew Suarez | OAK | 2019 | 26 | 105.0 | 69 | 54 | 15 |
| Scott Blewett | OAK | 2020 | 24 | 83.2 | 65 | 50 | 15 |
| Thomas Hatch | COL | 2022 | 27 | 167.1 | 115 | 100 | 15 |
| Zach Eflin | LAA | 2022 | 28 | 184.1 | 93 | 78 | 15 |
| Sonny Gray | ATL | 2020 | 30 | 179.2 | 105 | 91 | 14 |
| Chris Archer | COL | 2022 | 33 | 180.1 | 121 | 107 | 14 |
| Blake Snell | CHC | 2020 | 27 | 193.0 | 113 | 99 | 14 |
| Jacob Nix | SEA | 2023 | 27 | 179.0 | 104 | 91 | 13 |
| Dustin May | LAD | 2023 | 25 | 131.1 | 77 | 64 | 13 |
| Shane Baz | BOS | 2023 | 24 | 194.0 | 90 | 77 | 13 |
| Thomas Hatch | CIN,STL | 2023 | 28 | 150.2 | 96 | 83 | 13 |
| Jose Quintana | TOR | 2020 | 31 | 196.2 | 116 | 103 | 13 |
| Yu Darvish | SEA,WAS,PHI,TOR | 2020 | 33 | 128.2 | 107 | 94 | 13 |
| Jon Gray | BOS | 2022 | 30 | 162.1 | 79 | 66 | 13 |
| Trevor Williams | CHC | 2019 | 27 | 121.0 | 110 | 97 | 13 |
| Brad Keller | PHI,HOU,COL | 2021 | 25 | 152.0 | 118 | 105 | 13 |
| Spencer Turnbull | COL | 2020 | 27 | 187.0 | 122 | 110 | 12 |
| Jordan Montgomery | WAS | 2022 | 29 | 126.0 | 115 | 103 | 12 |
| Patrick Sandoval | NYY | 2023 | 26 | 174.0 | 95 | 83 | 12 |