Jack O'Connor
1887–1910 · 21 seasons · Bats right, throws right · Born 1866
More than one Major Leaguer has this name. This page is the Jack O'Connor who played 1887–1910. The other one:
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Hitting
| Season | Team | Lg | G | PA | AB | R | H | 2B | 3B | HR | RBI | BB | SO | SB | AVG | OBP | SLG | OPS | WAR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1887 | Cincinnati Red Stockings | OTH | 12 | 42 | 40 | 4 | 4 | 0 | 0 | 0 | 1 | 2 | 0 | 3 | .100 | .143 | .100 | .243 | -0.3 |
| 1888 | Cincinnati Red Stockings | OTH | 36 | 144 | 137 | 14 | 28 | 3 | 1 | 1 | 17 | 6 | 10 | 12 | .204 | .243 | .263 | .506 | 0.0 |
| 1889 | Columbus Solons | OTH | 107 | 435 | 398 | 69 | 107 | 17 | 7 | 4 | 60 | 33 | 37 | 26 | .269 | .331 | .377 | .708 | 2.3 |
| 1890 | Columbus Solons | OTH | 121 | 496 | 457 | 89 | 148 | 14 | 10 | 2 | 66 | 38 | 0 | 29 | .324 | .377 | .411 | .788 | 4.2 |
| 1891 | Columbus Solons | OTH | 56 | 240 | 229 | 28 | 61 | 12 | 3 | 0 | 37 | 11 | 14 | 10 | .266 | .300 | .345 | .645 | 0.5 |
| 1892 | Cleveland Spiders | NL | 140 | 599 | 572 | 71 | 142 | 22 | 5 | 1 | 58 | 25 | 48 | 17 | .248 | .282 | .309 | .592 | -0.1 |
| 1893 | Cleveland Spiders | NL | 96 | 416 | 384 | 72 | 110 | 23 | 1 | 4 | 75 | 29 | 12 | 29 | .286 | .341 | .383 | .724 | 1.3 |
| 1894 | Cleveland Spiders | NL | 86 | 349 | 330 | 67 | 104 | 23 | 7 | 2 | 51 | 15 | 7 | 15 | .315 | .345 | .445 | .790 | 0.7 |
| 1895 | Cleveland Spiders | NL | 90 | 389 | 343 | 52 | 100 | 14 | 10 | 0 | 58 | 31 | 22 | 11 | .292 | .355 | .391 | .746 | 0.8 |
| 1896 | Cleveland Spiders | NL | 68 | 281 | 256 | 41 | 76 | 11 | 1 | 1 | 43 | 15 | 12 | 15 | .297 | .343 | .359 | .702 | 0.5 |
| 1897 | Cleveland Spiders | NL | 103 | 432 | 397 | 49 | 115 | 21 | 4 | 2 | 69 | 26 | 21 | 20 | .290 | .338 | .378 | .716 | 0.2 |
| 1898 | Cleveland Spiders | NL | 131 | 517 | 478 | 50 | 119 | 17 | 4 | 1 | 56 | 26 | 17 | 8 | .249 | .291 | .308 | .598 | 0.1 |
| 1899 | St. Louis Perfectos | NL | 84 | 313 | 289 | 33 | 73 | 5 | 6 | 0 | 43 | 15 | 6 | 7 | .253 | .299 | .311 | .610 | 0.0 |
| 1900 | Pittsburgh Pirates | NL | 53 | 189 | 179 | 19 | 42 | 4 | 1 | 0 | 25 | 5 | 6 | 5 | .235 | .271 | .268 | .539 | -0.2 |
| 1901 | Pittsburgh Pirates | NL | 61 | 220 | 202 | 16 | 39 | 7 | 3 | 0 | 22 | 10 | 17 | 2 | .193 | .238 | .257 | .496 | -0.6 |
| 1902 | Pittsburgh Pirates | NL | 49 | 176 | 170 | 13 | 50 | 1 | 2 | 1 | 28 | 3 | 11 | 2 | .294 | .306 | .341 | .648 | 0.6 |
| 1903 | New York Highlanders | AL | 64 | 224 | 212 | 13 | 43 | 4 | 1 | 0 | 12 | 8 | 21 | 4 | .203 | .235 | .231 | .466 | -1.0 |
| 1904 | St. Louis Browns | AL | 14 | 50 | 47 | 4 | 10 | 1 | 0 | 0 | 2 | 2 | 2 | 0 | .213 | .245 | .234 | .479 | -0.1 |
| 1906 | St. Louis Browns | AL | 55 | 184 | 174 | 8 | 33 | 0 | 0 | 0 | 11 | 2 | 7 | 4 | .190 | .199 | .190 | .389 | -0.8 |
| 1907 | St. Louis Browns | AL | 25 | 92 | 89 | 2 | 14 | 2 | 0 | 0 | 4 | 0 | 15 | 0 | .157 | .176 | .180 | .356 | -0.7 |
| 1910 | St. Louis Browns | AL | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | — | — | — | — | — |
| Subtotal | American & National Leagues · 16 seasons | 1120 | 4431 | 4122 | 510 | 1070 | 155 | 45 | 12 | 557 | 212 | 224 | 139 | .260 | .300 | .328 | .628 | 0.7 | |
| Subtotal | Other leagues · 5 seasons | 332 | 1357 | 1261 | 204 | 348 | 46 | 21 | 7 | 181 | 90 | 61 | 80 | .276 | .327 | .362 | .689 | 6.7 | |
| Career | 21 seasons | 1452 | 5788 | 5383 | 714 | 1418 | 201 | 66 | 19 | 738 | 302 | 285 | 219 | .263 | .307 | .336 | .643 | 7.4 | |
The WAR columns are worked out on this site — they are not part of the source data, and they will not match Baseball-Reference exactly.
Everything else on this page comes straight from the Lahman database. WAR is our own calculation from those same season lines: fielding is estimated from putouts and assists rather than measured, fielding innings are missing before 1954, and the fielding component is capped. Treat it as a reasonable estimate of value, not as a record. The season tool explains the method in full.
— means the value is not in the source for that season, which is not the same as zero. In the Career and Subtotal rows it marks a statistic that cannot be added up across seasons — wOBA and FIP both need league constants that change every year, so we leave them blank rather than invent one. Leagues on this page: OTH (Other leagues), NL (National League), AL (American League).
Data for 1871 to 2025: Lahman Baseball Database 2025, compiled by SABR (Society for American Baseball Research) and licensed under CC BY-SA 3.0 Unported. Negro Leagues data licensed from Seamheads.com and included under SABR major-league recommendations (2021-02-11, 2024-06-03). The season lines on this page are our own derivative of that database — the WAR columns are computed here — and they are published under the same CC BY-SA 3.0 Unported licence, as ShareAlike requires. That database is published once a season is complete, so the 2026 figures on this site come from a different place: the MLB Stats API, whose notice reads “Copyright 2026 MLB Advanced Media, L.P. Use of any content on this page acknowledges agreement to the terms posted here http://gdx.mlb.com/components/copyright.txt”. Those numbers are MLB Advanced Media, L.P.’s, not SABR (Society for American Baseball Research)’s, and they carry that notice rather than the CC BY-SA 3.0 Unported licence above. Not affiliated with, endorsed by, or connected to Major League Baseball or any of its clubs.