| Most Earned Runs Allowed in Season | |||||||
| No Changes in 2005 | |||||||
| Rank | PlayerID | Season | IP | ER | |||
| 1 | Kruger, Larry | 1988 | 81.00 | 81 | |||
| 2 | Briley, Dennis | 1984 | 74.00 | 72 | |||
| 3 | Worrell, Tim | 1990 | 131.00 | 67 | |||
| 4 | Landers, Torrey | 1995 | 88.00 | 63 | |||
| 5 | Carter, Jeff | 1988 | 122.33 | 61 | |||
| - | Thorsteinson, Brett | 1988 | 72.33 | 61 | |||
| - | Worrell, Tim | 1987 | 80.33 | 61 | |||
| 8 | Carter, Jeff | 1990 | 93.00 | 59 | |||
| - | Gray, Mike | 1985 | 64.00 | 59 | |||
| 10 | Mohr, Kevin | 2000 | 87.33 | 58 | |||
| - | Wicks, Doug | 1985 | 81.67 | 58 | |||
| - | Conrady, Jeff | 1984 | 55.33 | 58 | |||
| 13 | Rouwenhorst, Jonathon | 2000 | 68.00 | 55 | |||
| - | Johnson, Carl | 1987 | 122.33 | 55 | |||
| 15 | Johnson, Gary | 1984 | 45.33 | 53 | |||
| 16 | Somawang, Joey | 1975 | 76.33 | 52 | |||
| - | Wright, Tom | 1970 | 59.67 | 52 | |||
| 18 | Schmidt, Brian | 1995 | 137.00 | 51 | |||
| - | Cooper, Denny | 1985 | 65.67 | 51 | |||
| 20 | Mummert, Jeremy | 2002 | 56.67 | 50 | |||
| - | Rasmussen, Den | 1966 | 137.00 | 50 | |||
| 22 | Kepner, Kevin | 1992 | 60.67 | 49 | |||
| 23 | Ekin, Chad | 2002 | 96.00 | 48 | |||
| - | Orr, Ben | 2001 | 109.66 | 48 | |||
| - | Griffin, Sonny | 1993 | 77.00 | 48 | |||
| - | Keller, Bob | 1988 | 69.67 | 48 | |||
| 27 | Briley, Dennis | 1986 | 95.33 | 47 | |||
| - | Briley, Dennis | 1985 | 68.67 | 47 | |||
| - | Cooper, Craig | 1984 | 43.67 | 47 | |||
| 30 | Johnson, Carl | 1986 | 43.33 | 46 | |||
| - | Hernandez, Ed | 1975 | 67.67 | 46 | |||