| Most Unearned Runs Allowed | |||||||
|---|---|---|---|---|---|---|---|
| Player | Team | Year | Age | IP | R | ER | UER |
| Max Scherzer | NYM | 2016 | 31 | 189.2 | 91 | 68 | 23 |
| Jesús Torres | KC | 2019 | 25 | 150.0 | 113 | 90 | 23 |
| Cole Hamels | PHI,ATL | 2012 | 28 | 185.1 | 114 | 93 | 21 |
| Roy Halladay | PHI,TOR | 2012 | 35 | 258.1 | 101 | 81 | 20 |
| Josh Tomlin | MIN | 2013 | 28 | 223.1 | 108 | 88 | 20 |
| Trevor Bauer | ATL,NYY | 2020 | 29 | 201.2 | 93 | 73 | 20 |
| Jacob Turner | DET | 2012 | 21 | 151.1 | 111 | 92 | 19 |
| Ian Kennedy | TOR,STL,NYY | 2012 | 27 | 156.0 | 120 | 101 | 19 |
| Jordan Lyles | HOU | 2013 | 22 | 218.2 | 123 | 104 | 19 |
| Sean O'Sullivan | LAA,TEX | 2013 | 25 | 191.1 | 93 | 74 | 19 |
| Phil Hughes | MIN | 2013 | 27 | 207.1 | 105 | 87 | 18 |
| Madison Bumgarner | TOR | 2012 | 22 | 210.1 | 102 | 84 | 18 |
| Tadaaki Otsuka | BAL | 2016 | 30 | 149.0 | 107 | 89 | 18 |
| Yu Darvish | TEX | 2014 | 27 | 213.0 | 129 | 111 | 18 |
| Cody Ponce | CHW | 2017 | 23 | 187.1 | 98 | 80 | 18 |
| Brady Aiken | ATL | 2020 | 23 | 173.2 | 96 | 78 | 18 |
| Jaime Garcia | NYY | 2016 | 29 | 177.2 | 125 | 108 | 17 |
| James McDonald | STL | 2013 | 28 | 208.1 | 97 | 80 | 17 |
| Kyle Drabek | ARI | 2012 | 24 | 207.1 | 100 | 83 | 17 |
| Vance Worley | OAK | 2014 | 26 | 201.1 | 95 | 78 | 17 |