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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | G | GS | AB | R | H | 2B | 3B | HR | RBI | SB | CS | BB | SO | AVG | OBP | SLG | OPS | WAR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Darby O'Brien | 1901-1903 | 339 | 300 | 1210 | 151 | 308 | 50 | 17 | 17 | 124 | 72 | 29 | 84 | 121 | .255 | .304 | .366 | .670 | 6.0 |
| Tom O'Brien | 1901-1914 | 535 | 134 | 803 | 88 | 208 | 36 | 4 | 2 | 90 | 17 | 15 | 54 | 87 | .259 | .308 | .321 | .630 | 2.2 |
| Jack O'Connor | 1901-1908 | 249 | 101 | 409 | 35 | 108 | 13 | 6 | 4 | 41 | 9 | 9 | 24 | 41 | .264 | .304 | .355 | .659 | 1.5 |
| Charley O'Leary | 1904-1906 | 411 | 369 | 1411 | 120 | 303 | 36 | 6 | 3 | 83 | 30 | 43 | 67 | 106 | .215 | .255 | .255 | .510 | 0.3 |
| Mike O'Rourke | 1901-1910 | 214 | 182 | 538 | 33 | 58 | 4 | 0 | 0 | 28 | 0 | 0 | 22 | 158 | .108 | .146 | .115 | .261 | -5.4 |
| Tim O'Rourke | 1901-1904 | 115 | 1 | 111 | 14 | 29 | 2 | 0 | 1 | 22 | 5 | 2 | 12 | 5 | .261 | .333 | .306 | .640 | 0.5 |
| Frank O'Shea | 1907-1913 | 420 | 268 | 879 | 75 | 197 | 32 | 14 | 0 | 80 | 14 | 25 | 53 | 60 | .224 | .273 | .292 | .566 | 1.7 |
| Rebel Oakes | 1909-1914 | 538 | 516 | 1879 | 209 | 456 | 38 | 18 | 10 | 205 | 108 | 63 | 163 | 241 | .243 | .304 | .298 | .602 | -0.5 |
| Dave Oldfield | 1901-1902 | 145 | 130 | 419 | 40 | 84 | 4 | 0 | 8 | 45 | 0 | 0 | 48 | 56 | .200 | .289 | .267 | .556 | -0.0 |
| Rube Oldring | 1905-1906 | 67 | 52 | 204 | 17 | 51 | 10 | 2 | 1 | 25 | 11 | 6 | 4 | 24 | .250 | .275 | .333 | .608 | 1.1 |
| Frank Olin | 1901-1903 | 137 | 50 | 258 | 34 | 84 | 8 | 2 | 2 | 31 | 7 | 4 | 23 | 46 | .326 | .389 | .395 | .785 | 2.1 |
| Dave Orr | 1901-1902 | 116 | 58 | 276 | 31 | 89 | 16 | 9 | 3 | 36 | 0 | 1 | 7 | 43 | .322 | .346 | .478 | .824 | 1.8 |
| Al Orth | 1904-1914 | 132 | 43 | 174 | 19 | 47 | 5 | 5 | 0 | 22 | 1 | 3 | 2 | 21 | .270 | .282 | .356 | .639 | 1.5 |
| Harry Ostdiek | 1904-1904 | 7 | 5 | 18 | 1 | 3 | 0 | 1 | 0 | 3 | 1 | 1 | 3 | 4 | .167 | .318 | .278 | .596 | 0.1 |
| Champ Osteen | 1903-1904 | 38 | 37 | 147 | 19 | 29 | 1 | 6 | 2 | 13 | 0 | 4 | 3 | 19 | .197 | .229 | .327 | .555 | 0.2 |
| Frank Owen | 1901-1906 | 156 | 110 | 411 | 29 | 63 | 9 | 0 | 2 | 22 | 4 | 14 | 31 | 106 | .153 | .216 | .190 | .406 | -2.4 |
| Frank Owens | 1905-1905 | 1 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | .000 | .000 | .000 | -0.0 |
