Research & Reports
Team Records
Seattle Marinerz : ERA
| Team | Season | ERA |
| Seattle Marinerz | 132 | 3.649 |
| Seattle Marinerz | 85 | 3.933 |
| Seattle Marinerz | 86 | 3.989 |
| Seattle Marinerz | 113 | 4.108 |
| Seattle Marinerz | 131 | 4.193 |
| Seattle Marinerz | 106 | 4.299 |
| Seattle Marinerz | 91 | 4.417 |
| Seattle Marinerz | 116 | 4.684 |
| Seattle Marinerz | 87 | 4.768 |
| Seattle Marinerz | 104 | 4.959 |
| Seattle Marinerz | 105 | 5.129 |
| Seattle Marinerz | 92 | 5.145 |
| Seattle Marinerz | 114 | 5.279 |
| Seattle Marinerz | 94 | 5.508 |
| Seattle Marinerz | 93 | 5.515 |
| Seattle Marinerz | 107 | 5.604 |
| Seattle Marinerz | 95 | 6.205 |
