| Lowest ERA in Season | ||||||||
| Min. 50 Innings Pitched | ||||||||
| Updated 7/19/2005 | ||||||||
| Rank | PlayerID | Season | Games | IP | ER | ERA | ||
| 1 | Logsdon, Jessica | 2000 | 31 | 188.66 | 17 | 0.63 | ||
| 2 | Logsdon, Jessica | 2001 | 42 | 207.33 | 20 | 0.68 | ||
| 3 | Logsdon, Jessica | 1999 | 21 | 136.00 | 18 | 0.93 | ||
| 4 | Salios, Melissa | 2001 | 12 | 51.33 | 7 | 0.95 | ||
| 5 | Logsdon, Jessica | 2002 | 40 | 227.67 | 40 | 1.23 | ||
| 6 | Fox, Melissa | 2000 | 27 | 142.00 | 28 | 1.38 | ||
| 7 | Gustaveson, Katie | 2005 | 40 | 191.33 | 39 | 1.43 | ||
| 8 | Fox, Melissa | 2001 | 25 | 131.33 | 28 | 1.49 | ||
| 9 | Fox, Melissa | 1999 | 23 | 147.00 | 32 | 1.52 | ||
| 10 | Salios, Melissa | 2002 | 26 | 104.67 | 24 | 1.61 | ||
| 11 | Gustaveson, Katie | 2004 | 34 | 166.00 | 42 | 1.77 | ||
| 12 | Dinsmore, Mary | 2005 | 24 | 90.33 | 24 | 1.86 | ||
| 13 | Benavidez, Jennifer | 2003 | 30 | 151.00 | 46 | 2.13 | ||
| 14 | Raffanti, Candace | 2000 | 18 | 51.00 | 16 | 2.20 | ||
| 15 | White, Melissa | 1995 | 18 | 104.99 | 38 | 2.53 | ||
| 16 | Gray, Joanna | 2003 | 26 | 99.00 | 39 | 2.76 | ||
| 17 | Dinsmore, Mary | 2004 | 18 | 69.33 | 34 | 3.43 | ||
| 18 | Fulton, Debbee | 1996 | 11 | 54.00 | 27 | 3.50 | ||
| 19 | Dinsmore, Mary | 2003 | 23 | 89.00 | 53 | 4.17 | ||
| 20 | Linhares, Jessica | 1994 | 29 | 181.00 | 147 | 5.69 | ||
| 21 | Linhares, Jessica | 1995 | 17 | 81.33 | 76 | 6.54 | ||
| 22 | Curiel, Jessica | 1998 | 28 | 155.00 | 153 | 6.91 | ||