| ERA* Wins Losses Saves Games Games Started Complete Games Shutouts Innings Pitched Hits Allowed Homeruns Allowed Strikeouts Walks Allowed |
| Boston ERA* - Career Leaders |
| Rank | Player | Value |
| 1 | Carl Lundgren | 3.210 |
| 2 | Red Munger | 3.740 |
| 3 | Lefty Leifield | 3.780 |
| 4 | Jim Bunning | 3.930 |
| 5 | Al Demaree | 4.230 |
| 6 | Rube Foster | 5.040 |