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| "O" Batting Register | |
| Pitching Register | Batting Glossary |
| Player | From-To | G | AB | R | H | 2B | 3B | HR | RBI | SB | CS | BB | SO | AVG | OBP | SLG | OPS |
| Claude Obrien | 2015-2025 | 1437 | 5099 | 649 | 1298 | 274 | 38 | 91 | 573 | 313 | 110 | 220 | 333 | .255 | .290 | .377 | .667 |
| Mauro Occhipinti | 2001-2001 | 32 | 64 | 7 | 6 | 3 | 0 | 0 | 1 | 0 | 0 | 3 | 23 | .094 | .134 | .141 | .275 |
| Roberto Oceguera | 2012-2012 | 10 | 12 | 2 | 2 | 0 | 0 | 0 | 1 | 0 | 0 | 2 | 5 | .167 | .286 | .167 | .452 |
| Alex Oconnell | 2010-2025 | 1915 | 6454 | 762 | 1559 | 401 | 39 | 217 | 841 | 132 | 86 | 282 | 1588 | .242 | .273 | .417 | .690 |
| Jonathan Odom | 2001-2009 | 1324 | 4761 | 650 | 1288 | 249 | 13 | 103 | 626 | 146 | 103 | 377 | 831 | .271 | .329 | .393 | .722 |
| Kenneth Odoms | 2008-2012 | 319 | 992 | 131 | 248 | 52 | 3 | 35 | 120 | 19 | 5 | 59 | 209 | .250 | .300 | .414 | .714 |
| Jerry Ogawa | 2021-2025 | 609 | 2248 | 371 | 561 | 141 | 7 | 119 | 422 | 5 | 2 | 266 | 659 | .250 | .333 | .477 | .810 |
| Jonas Ogazon | 2015-2025 | 902 | 2991 | 397 | 848 | 145 | 8 | 74 | 411 | 23 | 8 | 264 | 288 | .284 | .339 | .412 | .751 |
| Antonio Ohl | 2006-2024 | 2863 | 11053 | 1939 | 3583 | 525 | 12 | 545 | 1873 | 26 | 7 | 1393 | 822 | .324 | .405 | .522 | .927 |
| Dan Ohlson | 2010-2020 | 542 | 1626 | 201 | 382 | 92 | 5 | 21 | 166 | 3 | 1 | 198 | 353 | .235 | .321 | .336 | .657 |
| James Okane | 2001-2009 | 829 | 2756 | 355 | 689 | 80 | 30 | 86 | 354 | 82 | 23 | 228 | 463 | .250 | .313 | .394 | .707 |
| Robert Oldenburg | 2001-2014 | 742 | 1912 | 254 | 450 | 67 | 11 | 60 | 250 | 9 | 7 | 178 | 333 | .235 | .300 | .376 | .676 |
| Giuseppe Oliva | 2010-2025 | 1981 | 6371 | 860 | 1696 | 271 | 42 | 103 | 721 | 9 | 26 | 893 | 1433 | .266 | .357 | .370 | .728 |
| Alfonso Olivar | 2022-2025 | 110 | 304 | 37 | 68 | 23 | 0 | 7 | 38 | 0 | 0 | 23 | 59 | .224 | .281 | .368 | .649 |
| Carlos Olivarria | 2025-2025 | 24 | 41 | 8 | 9 | 1 | 2 | 2 | 9 | 0 | 0 | 7 | 15 | .220 | .333 | .488 | .821 |
| Stephen Olivares | 2014-2014 | 18 | 22 | 1 | 5 | 1 | 0 | 0 | 1 | 2 | 0 | 0 | 0 | .227 | .227 | .273 | .500 |
| Santiago Oliva | 2021-2022 | 11 | 33 | 3 | 11 | 4 | 0 | 0 | 6 | 0 | 0 | 1 | 4 | .333 | .343 | .455 | .797 |
| Santiago Oliva | 2013-2015 | 29 | 65 | 7 | 15 | 2 | 0 | 2 | 7 | 0 | 0 | 5 | 13 | .231 | .286 | .354 | .640 |
| Hector Olivas | 2018-2025 | 894 | 3527 | 373 | 927 | 188 | 9 | 76 | 476 | 25 | 17 | 163 | 272 | .263 | .296 | .386 | .682 |
| Lamont Olivas | 2013-2025 | 656 | 2085 | 259 | 598 | 105 | 6 | 2 | 216 | 13 | 10 | 120 | 136 | .287 | .326 | .346 | .672 |
| Bernie Oliveras | 2015-2025 | 1089 | 3144 | 461 | 831 | 133 | 30 | 43 | 380 | 56 | 52 | 320 | 473 | .264 | .334 | .367 | .701 |
| Ronald Oliveros | 2023-2025 | 338 | 1348 | 230 | 401 | 73 | 5 | 71 | 259 | 35 | 28 | 82 | 307 | .297 | .335 | .517 | .852 |
| Silas Oliver | 2001-2004 | 160 | 268 | 29 | 60 | 9 | 0 | 3 | 24 | 2 | 0 | 17 | 43 | .224 | .271 | .291 | .562 |
| Bill Olmos | 2020-2025 | 445 | 1285 | 196 | 357 | 83 | 1 | 11 | 132 | 0 | 1 | 183 | 257 | .278 | .374 | .370 | .744 |
| Bradley Olmos | 2001-2013 | 2079 | 8260 | 1260 | 2164 | 401 | 43 | 513 | 1612 | 21 | 5 | 486 | 1397 | .262 | .309 | .507 | .816 |
| Paolo Olmos | 2023-2023 | 42 | 24 | 2 | 6 | 3 | 0 | 0 | 4 | 0 | 1 | 4 | 9 | .250 | .357 | .375 | .732 |
| Lester Olson | 2001-2001 | 38 | 59 | 5 | 6 | 1 | 0 | 0 | 1 | 0 | 0 | 2 | 19 | .102 | .129 | .119 | .248 |
| Louis Olson | 2013-2024 | 179 | 315 | 49 | 77 | 17 | 1 | 3 | 34 | 5 | 7 | 21 | 54 | .244 | .297 | .333 | .631 |
| Richard Omar | 2001-2012 | 356 | 1073 | 69 | 186 | 38 | 8 | 6 | 72 | 3 | 1 | 62 | 235 | .173 | .224 | .240 | .464 |
| Michael Oneal | 2016-2025 | 75 | 139 | 12 | 23 | 7 | 1 | 0 | 8 | 0 | 0 | 6 | 29 | .165 | .208 | .230 | .438 |
| Player | From-To | G | AB | R | H | 2B | 3B | HR | RBI | SB | CS | BB | SO | AVG | OBP | SLG | OPS |
| Luis Orellana | 2014-2024 | 1539 | 5558 | 756 | 1585 | 347 | 49 | 147 | 882 | 112 | 81 | 241 | 836 | .285 | .322 | .445 | .767 |
| Leo Orem | 2021-2025 | 579 | 2265 | 306 | 689 | 113 | 5 | 59 | 360 | 26 | 15 | 99 | 156 | .304 | .336 | .437 | .772 |
| Carmelo Ornelas | 2025-2025 | 9 | 29 | 1 | 7 | 0 | 0 | 1 | 3 | 1 | 0 | 0 | 6 | .241 | .241 | .345 | .586 |
| Mario Ornelas | 2023-2025 | 472 | 1725 | 342 | 466 | 115 | 3 | 98 | 358 | 1 | 0 | 301 | 266 | .270 | .381 | .511 | .892 |
| Edgardo Orsini | 2015-2019 | 101 | 261 | 21 | 53 | 7 | 0 | 0 | 12 | 0 | 1 | 22 | 66 | .203 | .274 | .230 | .504 |
| Antonio Ortega | 2012-2025 | 1795 | 6349 | 793 | 1687 | 353 | 25 | 78 | 656 | 28 | 9 | 570 | 1223 | .266 | .327 | .366 | .693 |
| William Ortez | 2001-2007 | 202 | 433 | 62 | 102 | 20 | 3 | 2 | 41 | 7 | 5 | 51 | 94 | .236 | .318 | .309 | .627 |
| Renato Ortiz | 2021-2025 | 745 | 2785 | 378 | 668 | 104 | 10 | 153 | 435 | 13 | 3 | 185 | 473 | .240 | .288 | .449 | .738 |
| Robert Ortiz | 2001-2001 | 6 | 15 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 3 | .067 | .176 | .067 | .243 |
| Jason Osborne | 2001-2001 | 30 | 22 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9 | .045 | .045 | .045 | .091 |
| Paul Osborne | 2001-2010 | 84 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | .000 | .000 | .000 | .000 |
| Juan Osuna | 2020-2025 | 124 | 360 | 51 | 113 | 25 | 0 | 6 | 54 | 10 | 4 | 50 | 40 | .314 | .395 | .433 | .828 |
| Greg Otten | 2012-2012 | 4 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | .000 | .000 | .000 | .000 |
| Doyle Oubre | 2015-2017 | 2 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | .000 | .000 | .000 | .000 |
| Jordon Oubre | 2014-2024 | 1560 | 6201 | 1010 | 1796 | 394 | 88 | 84 | 650 | 234 | 116 | 442 | 615 | .290 | .338 | .422 | .760 |
| William Outen | 2004-2018 | 2046 | 7829 | 1064 | 2244 | 193 | 37 | 306 | 1224 | 182 | 113 | 374 | 531 | .287 | .322 | .438 | .760 |
| Michael Ovellette | 2013-2019 | 91 | 57 | 20 | 14 | 4 | 0 | 0 | 3 | 6 | 1 | 2 | 9 | .246 | .283 | .316 | .599 |
| David Owens | 2001-2001 | 21 | 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | .000 | .000 | .000 | .000 |
| Les Ownby | 2001-2001 | 28 | 57 | 1 | 11 | 2 | 0 | 0 | 4 | 2 | 0 | 2 | 13 | .193 | .220 | .228 | .448 |
| Dennis Oyola | 2001-2008 | 561 | 1720 | 187 | 387 | 72 | 4 | 39 | 200 | 17 | 9 | 129 | 251 | .225 | .283 | .340 | .623 |
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