| Most Unearned Runs Allowed | |||||||
|---|---|---|---|---|---|---|---|
| Player | Team | Year | Age | IP | R | ER | UER |
| Merrill Kelly | LAA | 2021 | 32 | 171.2 | 123 | 97 | 26 |
| Miles Mikolas | NYY | 2021 | 32 | 186.0 | 121 | 98 | 23 |
| Kyle Freeland | LAA | 2021 | 28 | 143.2 | 102 | 85 | 17 |
| Evan [UNRATED] Steele | TEX | 2021 | 24 | 153.0 | 111 | 94 | 17 |
| Michael Pineda | ARI | 2022 | 33 | 134.0 | 74 | 57 | 17 |
| Wade Miley | BOS | 2022 | 35 | 158.2 | 79 | 62 | 17 |
| Zack Greinke | COL | 2022 | 38 | 156.0 | 113 | 97 | 16 |
| Chris Archer | HOU | 2021 | 32 | 203.0 | 94 | 78 | 16 |
| Rick [UNRATED] Porcello | HOU | 2021 | 32 | 124.2 | 108 | 92 | 16 |
| Taijuan Walker | ARI | 2022 | 29 | 147.1 | 124 | 108 | 16 |
| Jake Faria | STL | 2022 | 28 | 156.0 | 95 | 79 | 16 |
| Adam Wainwright | PHI | 2023 | 41 | 152.1 | 86 | 71 | 15 |
| Adam Wainwright | PHI | 2021 | 39 | 100.1 | 73 | 59 | 14 |
| Eduardo Rodriguez | TB | 2022 | 29 | 190.2 | 105 | 91 | 14 |
| Andrew Heaney | BAL | 2021 | 30 | 190.2 | 91 | 77 | 14 |
| Marco Gonzales | SEA | 2021 | 29 | 198.1 | 92 | 78 | 14 |
| Brad Keller | WSH | 2021 | 25 | 191.2 | 115 | 101 | 14 |
| Dinelson Lamet | PIT | 2021 | 28 | 187.2 | 88 | 74 | 14 |
| Bruce Zimmermann | SD | 2021 | 26 | 178.0 | 116 | 102 | 14 |
| Spencer Turnbull | TOR | 2021 | 28 | 124.1 | 104 | 91 | 13 |