1911 Buck O'Brien
1911 Buck O'Brien PITCH WAA
| Rank | WAA | IP | ERA | Gs | Gr | Tm |
| +041+ | 3.40 | 47.7 | 0.38 | 5 | 1 | BOS |
1911 Buck O'Brien PITCH WAR
| Rank | WAR | W | L | SV | SO | HR | Age |
| +106+ | 2.2 | 5 | 1 | 0 | 31 | 0 | 29 |
Note: Daily data in early seasons can be incomplete and will differ from end of year results due to possible missing games, unknown allocation of unearned runs, scorekeeper changes/disputes, etc. The sum of all changes impact league wide averages that WAA calculations depend upon for all players. The end of year Rank/WAA record is correct.
Buck O'Brien 1911 Bi-Weekly Snapshots
Post Season Buck O'Brien WAA
Buck O'Brien Post Season Games
| Rank | WAA | IP | ERA | Gs | Gr | Tm |
| XXXXX | -0.29 | 9 | 5 | 2 | 0 | BOS |