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Jack O'Brien played 8 major-league seasons (1882-1890) as a C (275), 1B (149), OF (72), 3B (49), SS (20). Career totals and every year-by-year line below come from the SABR/Lahman database (CC BY-SA), covering 1871-2025.
Showing 8 season lines
| Year | Age | Team | G | AB | R | H | HR | RBI | SB | BB | SO | AVG | OPS | OPS+ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1882 | 22 | PH4 | 62 | 241 | 44 | 73 | 3 | 37 | 0 | 13 | — | .303 | .758 | 160 |
| 1883 | 23 | PH4 | 94 | 390 | 74 | 113 | 0 | 70 | 0 | 25 | — | .290 | .709 | 132 |
| 1884 | 24 | PH4 | 36 | 138 | 25 | 39 | 1 | — | 0 | 9 | — | .283 | .702 | 134 |
| 1885 | 25 | PH4 | 62 | 225 | 35 | 60 | 2 | 30 | 0 | 20 | — | .267 | .682 | 121 |
| 1886 | 26 | PH4 | 105 | 423 | 65 | 107 | 0 | 56 | 23 | 38 | — | .253 | .670 | 113 |
| 1887 | 27 | BR3 | 30 | 123 | 18 | 28 | 1 | 17 | 8 | 6 | 7 | .228 | .564 | 60 |
| 1888 | 28 | BL2 | 57 | 196 | 25 | 44 | 0 | 18 | 14 | 17 | 24 | .224 | .631 | 106 |
| 1890 | 30 | PH4 | 109 | 433 | 80 | 113 | 4 | 80 | 31 | 52 | — | .261 | .765 | 131 |
| Year | Pos | G | GS | PO | A | E | DP |
|---|---|---|---|---|---|---|---|
| 1882 | C | 45 | 0 | 205 | 66 | 22 | 1 |
| 1882 | OF | 18 | 0 | 21 | 12 | 6 | 0 |
| 1882 | 1B | 1 | 0 | 7 | 0 | 0 | 0 |
| 1882 | 3B | 1 | 0 | 1 | 3 | 0 | 0 |
| 1883 | C | 58 | 0 | 301 | 58 | 51 | 3 |
| 1883 | OF | 25 | 0 | 54 | 6 | 8 | 2 |
| 1883 | 3B | 19 | 0 | 16 | 24 | 16 | 3 |
| 1883 | SS | 1 | 0 | 1 | 1 | 1 | 0 |
| 1884 | C | 30 | 0 | 169 | 43 | 16 | 6 |
| 1884 | OF | 5 | 0 | 11 | 1 | 3 | 1 |
| 1884 | 1B | 1 | 0 | 15 | 1 | 0 | 1 |
| 1885 | C | 43 | 0 | 193 | 58 | 27 | 3 |
| 1885 | SS | 9 | 0 | 8 | 29 | 8 | 2 |
| 1885 | 1B | 7 | 0 | 66 | 2 | 0 | 4 |
| 1885 | OF | 3 | 0 | 6 | 0 | 3 | 0 |
| 1885 | 3B | 2 | 0 | 3 | 6 | 0 | 1 |
| 1886 | C | 36 | 0 | 172 | 52 | 20 | 3 |
| 1886 | 3B | 27 | 0 | 21 | 69 | 20 | 3 |
| 1886 | 1B | 24 | 0 | 209 | 4 | 12 | 15 |
| 1886 | SS | 10 | 0 | 8 | 26 | 11 | 2 |
| 1886 | 2B | 7 | 0 | 14 | 18 | 6 | 3 |
| 1886 | OF | 3 | 0 | 2 | 1 | 1 | 0 |
| 1887 | C | 25 | 0 | 95 | 40 | 26 | 4 |
| 1887 | OF | 4 | 0 | 3 | 0 | 1 | 0 |
| 1887 | 2B | 1 | 0 | 0 | 2 | 0 | 0 |
| 1888 | C | 37 | 0 | 205 | 43 | 20 | 4 |
| 1888 | OF | 13 | 0 | 5 | 0 | 5 | 0 |
| 1888 | 1B | 7 | 0 | 76 | 0 | 1 | 5 |
| 1890 | 1B | 109 | 0 | 1018 | 52 | 26 | 61 |
| 1890 | C | 1 | 0 | 2 | 2 | 1 | 1 |
| 1890 | OF | 1 | 0 | 1 | 0 | 0 | 0 |
Team codes are the source codes (e.g. NYN for the New York Mets, BS1 for the 1875 Boston club). OPS+ is league-season normalized, not park-adjusted; unrecorded source values (such as RBI in the earliest recorded seasons) are absent, never zero-filled.
Jack O'Brien ranks on 1 all-time single-season position leaderboard (1871-2025, league-season-normalized OPS+ / ERA+).
| Rank | Board | Year | Stat |
|---|---|---|---|
| #29 | catchers | 1882 | 160 OPS+ |
Every career total and season line is computed from the SABR / Sean Lahman baseball database (2025 edition, CC BY-SA 3.0), the same source behind our historical position leaderboards. Rate stats use league-season normalization only (OPS+ and ERA+ as marked, never park-adjusted); unrecorded early-era values stay absent rather than being invented. Career totals sum only what the source records.
Award winners and MVP / Cy Young / Rookie of the Year voting history come from the same database; the year pages live under MLB award voting history. Official transactions (2011 to the current season) come from the MLB StatsAPI feed on our transactions archive.