| ERA* Wins Losses Saves Games Games Started Complete Games Shutouts Innings Pitched Hits Allowed Homeruns Allowed Strikeouts Walks Allowed |
| Boston Saves - Single Season Leaders |
| Rank | Player | Year | Value |
| 1 | Harry Byrd | 2017 | 25 |
| 2 | Jack Coombs | 2016 | 21 |
| 3 | Pud Galvin | 2016 | 1 |