| ERA* Wins Losses Saves Games Games Started Complete Games Shutouts Innings Pitched Hits Allowed Homeruns Allowed Strikeouts Walks Allowed |
| Montreal Losses - Single Season Leaders |
| Rank | Player | Year | Value |
| 1 | Bobby Shantz | 2016 | 12 |
| 2 | Babe Adams | 2016 | 10 |
| 3 | Bill Donovan | 2017 | 9 |
| Murry Dickson | 2017 | 9 | |
| 4 | Rube Walberg | 2016 | 8 |
| Lee Richmond | 2016 | 8 | |
| 5 | Babe Adams | 2017 | 7 |
| Warren Spahn | 2017 | 7 | |
| 6 | Slim Sallee | 2016 | 6 |
| Mel Harder | 2016 | 6 | |
| 7 | Rube Walberg | 2017 | 5 |
| 8 | Waite Hoyt | 2017 | 4 |
| Stan Williams | 2017 | 4 | |
| Murry Dickson | 2016 | 4 | |
| Jerry Staley | 2016 | 4 | |
| 9 | Waite Hoyt | 2016 | 3 |
| 10 | Mel Harder | 2017 | 1 |
| Jerry Staley | 2017 | 1 |