| Most Unearned Runs Allowed | |||||||
|---|---|---|---|---|---|---|---|
| Player | Team | Year | Age | IP | R | ER | UER |
| Juan Gómez | MIN | 2046 | 26 | 163.2 | 123 | 99 | 24 |
| Ivar van Aerden | SD | 2047 | 25 | 171.2 | 100 | 76 | 24 |
| Edgardo Aguirre | MIN | 2043 | 24 | 180.0 | 90 | 70 | 20 |
| Octávio Campos | STL | 2045 | 27 | 163.1 | 117 | 97 | 20 |
| Sean Snyder | CLE | 2047 | 33 | 204.1 | 89 | 69 | 20 |
| Albert Mercado | KC | 2029 | 29 | 194.0 | 135 | 115 | 20 |
| Ernie Chipende | ATL | 2036 | 33 | 182.1 | 101 | 82 | 19 |
| Zak Smith | TB | 2029 | 30 | 120.0 | 82 | 63 | 19 |
| Denver Noble | HOU | 2051 | 23 | 72.0 | 51 | 32 | 19 |
| Dave Jennings | MIL | 2033 | 24 | 164.0 | 114 | 95 | 19 |
| Duane Coleman | STL | 2045 | 30 | 186.1 | 98 | 79 | 19 |
| Jay Cragg | TOR | 2044 | 27 | 222.2 | 108 | 90 | 18 |
| Joe Brown | ARI,PIT | 2036 | 35 | 122.2 | 91 | 73 | 18 |
| Jim Allison | SEA | 2042 | 28 | 173.2 | 118 | 100 | 18 |
| Steve Henson | NYM | 2038 | 33 | 148.2 | 82 | 65 | 17 |
| Dick Schoutens | TOR | 2047 | 26 | 199.0 | 110 | 93 | 17 |
| Al Emerson | HOU | 2035 | 31 | 174.1 | 121 | 104 | 17 |
| Darrel Griffith | LAD | 2028 | 28 | 176.1 | 84 | 67 | 17 |
| Dave Butler | SD | 2040 | 34 | 193.2 | 94 | 77 | 17 |
| Greg Buckner | MIA | 2047 | 27 | 106.1 | 57 | 40 | 17 |