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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Floyd O'Brien | 1907-1913 | 602 | 458 | 1729 | 202 | 414 | 88 | 6 | 11 | 176 | 0 | 8 | 276 | 475 | .239 | .350 | .316 | .667 | -1.1 |
| Adam O'Connor | 1911-1913 | 36 | 8 | 35 | 4 | 8 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | .229 | .229 | .286 | .514 | -0.1 |
| Allen O'Leary | 1906-1911 | 641 | 550 | 2099 | 238 | 625 | 129 | 10 | 15 | 289 | 11 | 14 | 337 | 151 | .298 | .394 | .390 | .785 | 19.4 |
| Aimar Ochoa | 1907-1913 | 670 | 660 | 2347 | 242 | 683 | 123 | 9 | 10 | 276 | 6 | 6 | 233 | 272 | .291 | .354 | .364 | .718 | 13.1 |
| Ronaldo Ochoa | 1906-1909 | 483 | 349 | 1480 | 205 | 496 | 99 | 14 | 17 | 191 | 4 | 8 | 208 | 75 | .335 | .426 | .455 | .881 | 15.6 |
| Álvaro Ochoa | 1905-1913 | 549 | 386 | 1491 | 207 | 379 | 77 | 10 | 6 | 105 | 39 | 23 | 157 | 232 | .254 | .330 | .331 | .661 | 4.8 |
| Arturo Oliva | 1912-1913 | 148 | 141 | 541 | 71 | 172 | 47 | 7 | 2 | 65 | 4 | 7 | 15 | 67 | .318 | .339 | .442 | .780 | 1.5 |
| Gustavo Oliva | 1903-1912 | 55 | 5 | 37 | 3 | 6 | 0 | 0 | 1 | 3 | 0 | 0 | 0 | 13 | .162 | .162 | .243 | .405 | -0.4 |
| Eufemio Olivares | 1903-1913 | 615 | 544 | 1627 | 179 | 394 | 76 | 7 | 13 | 162 | 24 | 11 | 147 | 351 | .242 | .307 | .321 | .629 | 8.3 |
| Tadeo Olivares | 1911-1913 | 319 | 283 | 1086 | 130 | 329 | 69 | 6 | 8 | 129 | 8 | 10 | 138 | 84 | .303 | .383 | .400 | .783 | 5.8 |
| Ubaldo Olivarez | 1913-1913 | 78 | 48 | 195 | 24 | 51 | 9 | 0 | 0 | 14 | 0 | 4 | 26 | 40 | .262 | .350 | .308 | .657 | -0.2 |
| Ernesto Olivera | 1913-1913 | 44 | 42 | 153 | 25 | 53 | 5 | 2 | 1 | 21 | 0 | 0 | 10 | 20 | .346 | .386 | .425 | .810 | 1.2 |
| Édgar Oquendo | 1903-1910 | 595 | 384 | 1402 | 118 | 365 | 41 | 2 | 26 | 144 | 5 | 5 | 126 | 181 | .260 | .325 | .348 | .673 | 4.8 |
| Enrique Orea | 1904-1913 | 858 | 842 | 2799 | 246 | 712 | 120 | 6 | 11 | 229 | 2 | 9 | 204 | 415 | .254 | .309 | .313 | .622 | 8.8 |
| Pascual Orengo | 1907-1913 | 523 | 244 | 1141 | 136 | 320 | 83 | 4 | 9 | 132 | 0 | 1 | 112 | 157 | .280 | .352 | .384 | .736 | 1.9 |
| Hanrahan Orr | 1903-1904 | 155 | 93 | 354 | 31 | 99 | 8 | 2 | 6 | 48 | 0 | 2 | 25 | 28 | .280 | .326 | .364 | .691 | 0.5 |
| Peter Orr | 1908-1913 | 287 | 39 | 344 | 37 | 84 | 11 | 1 | 1 | 46 | 0 | 1 | 45 | 45 | .244 | .336 | .291 | .627 | -0.3 |
| Darío Ortiz | 1911-1912 | 12 | 0 | 11 | 2 | 6 | 2 | 0 | 0 | 2 | 0 | 0 | 1 | 1 | .545 | .583 | .727 | 1.311 | 0.3 |
| Germán Ortiz | 1903-1909 | 628 | 304 | 1449 | 201 | 324 | 45 | 15 | 36 | 152 | 17 | 22 | 207 | 450 | .224 | .332 | .350 | .682 | 5.5 |
| Pablo Ortiz | 1903-1913 | 744 | 134 | 1065 | 125 | 280 | 48 | 4 | 9 | 126 | 18 | 8 | 55 | 121 | .263 | .300 | .341 | .641 | 2.2 |
| Fernando Oviedo | 1913-1913 | 12 | 9 | 28 | 4 | 8 | 3 | 0 | 0 | 4 | 3 | 0 | 2 | 6 | .286 | .333 | .393 | .726 | 0.2 |
| Tubrady Owens | 1905-1913 | 960 | 807 | 3141 | 407 | 845 | 182 | 23 | 26 | 326 | 92 | 69 | 324 | 424 | .269 | .341 | .366 | .708 | 10.8 |
| Andy Oyler | 1903-1913 | 641 | 301 | 1075 | 133 | 268 | 29 | 2 | 41 | 150 | 18 | 10 | 102 | 209 | .249 | .322 | .394 | .716 | 4.9 |
