Buck O'Brien had a record of 5-1 with an ERA of 0.38 and 31 strikeouts in 6 appearances in his rookie season in 1911.
| NAME | SEASON | TM | G | W | L | W% | GS | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | K/9 | BB/9 | K/BB | HR/9 | K% | BB% | WHIP | BABIP | RA | ERA- | FIP | FIP- | H/9 | PRAA | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | B. O'Brien | 1911 |  BSA | 6 | 5 | 1 | .833 | 5 | 0.38 | 31 | 5 | 2 | 0 | 47.2 | 30 | 2 | 9 | 0 | 21 | 1 | 1 | 189 | 0 | 5.85 | 3.97 | 1.48 | 0.00 | 16.4 | 11.1 | 1.07 | .221 | 1.70 | 11 | 2.85 | 88 | 5.66 | 2 |
Games
| NAME | DATE | SEASON | TM | OPP | DEC | GS | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | | B. O'Brien | 10/6/1911 | 1911 | BSA | vs |  WSH | W | 1 | 2 | 1 | 0 | 0 | 9.0 | 6 | 1 | 0 | 4 | 0 | 0 | 34 | 0 | |||
| 2 | | B. O'Brien | 9/28/1911 | 1911 | BSA | vs |  CWS | W | 1 | 9 | 1 | 0 | 0 | 9.0 | 3 | 3 | 0 | 4 | 0 | 0 | 34 | 0 | |||
| 3 | | B. O'Brien | 9/21/1911 | 1911 | BSA | vs |  DET | L | 1 | 5 | 1 | 0 | 0 | 9.0 | 5 | 2 | 0 | 7 | 0 | 0 | 39 | 0 | |||
| 4 | | B. O'Brien | 9/16/1911 | 1911 | BSA | vs |  CLE | W | 1 | 0.00 | 12 | 1 | 1 | 0 | 9.0 | 8 | 0 | 0 | 0 | 2 | 0 | 0 | 34 | 0 | |
| 5 | | B. O'Brien | 9/12/1911 | 1911 | BSA | @ | WSH | W | 0 | 1 | 0 | 0 | 0 | 2.2 | 1 | 1 | 0 | 2 | 1 | 1 | 18 | 0 | |||
| 6 | | B. O'Brien | 9/9/1911 | 1911 | BSA | @ |  PHA | W | 1 | 0.00 | 3 | 1 | 1 | 0 | 9.0 | 6 | 0 | 0 | 0 | 3 | 0 | 0 | 36 | 0 | |
| Total | 5 | 0.38 | 31 | 5 | 2 | 0 | 47.2 | 30 | 2 | 9 | 0 | 21 | 1 | 1 | 189 | 0 |
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