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| "O" Pitching Register | |
| Batting Register | Pitching Glossary |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO | PWS |
| Wes Obermueller | 2004-2013 | 20 | 16 | .556 | 4.91 | 177 | 0 | 0 | 0 | 12 | 416.3 | 499 | 227 | 56 | 151 | 164 | 21.2 |
| Patrick O'Brien | 2009-2016 | 41 | 33 | .554 | 3.41 | 305 | 35 | 0 | 0 | 72 | 520.3 | 440 | 197 | 38 | 286 | 489 | 54.0 |
| Jose Oliveira | 2015-2020 | 15 | 25 | .375 | 3.93 | 301 | 3 | 0 | 0 | 8 | 354.6 | 378 | 155 | 38 | 101 | 218 | 20.3 |
| Miguel Olivo | 2003-2009 | 0 | 2 | .000 | 4.50 | 2 | 0 | 0 | 0 | 0 | 8.0 | 6 | 4 | 2 | 5 | 1 | 0.2 |
| Leonard Ollis | 2017-2021 | 75 | 45 | .625 | 3.33 | 158 | 158 | 16 | 4 | 0 | 1087.3 | 1033 | 402 | 92 | 167 | 1049 | 77.6 |
| Ranier Olmedo | 2007-2008 | 0 | 1 | .000 | 18.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 3 | 2 | 2 | 0 | 0 | 0.0 |
| Kevin Olsen | 2002-2007 | 2 | 0 | 1.000 | 3.00 | 23 | 0 | 0 | 0 | 1 | 24.0 | 24 | 8 | 2 | 1 | 9 | 2.1 |
| Scott Olsen | 2014-2016 | 25 | 20 | .556 | 3.74 | 71 | 68 | 2 | 1 | 1 | 460.0 | 464 | 191 | 60 | 102 | 354 | 25.5 |
| Ian Oquendo | 2007-2020 | 180 | 149 | .547 | 3.41 | 454 | 435 | 58 | 20 | 1 | 3073.3 | 2860 | 1164 | 178 | 740 | 2516 | 221.4 |
| Derrick Orlowski | 2021-2021 | 1 | 1 | .500 | 3.56 | 24 | 0 | 0 | 0 | 1 | 48.0 | 40 | 19 | 1 | 26 | 30 | 4.1 |
| Eddie Oropesa | 2002-2009 | 16 | 12 | .571 | 3.65 | 204 | 0 | 0 | 0 | 40 | 209.3 | 189 | 85 | 27 | 60 | 116 | 29.4 |
| Alejo Ortega | 2017-2021 | 58 | 60 | .492 | 4.19 | 145 | 138 | 30 | 7 | 2 | 995.3 | 1063 | 463 | 122 | 168 | 655 | 46.2 |
| Cristobal Ortego | 2009-2017 | 63 | 74 | .460 | 4.49 | 258 | 177 | 7 | 2 | 2 | 1197.0 | 1295 | 597 | 170 | 299 | 827 | 48.1 |
| Albert Ortiz | 2011-2011 | 0 | 1 | .000 | 6.00 | 1 | 1 | 0 | 0 | 0 | 6.0 | 5 | 4 | 0 | 4 | 7 | 0.1 |
| Javier Ortiz | 2006-2013 | 47 | 55 | .461 | 4.21 | 244 | 142 | 4 | 3 | 0 | 1018.6 | 1105 | 476 | 82 | 269 | 463 | 55.8 |
| Russ Ortiz | 1999-2008 | 10 | 11 | .476 | 4.48 | 43 | 29 | 1 | 0 | 0 | 207.0 | 212 | 103 | 15 | 81 | 108 | 9.2 |
| Valentin Ortiz | 2020-2021 | 2 | 10 | .167 | 5.92 | 15 | 15 | 0 | 0 | 0 | 79.0 | 89 | 52 | 11 | 40 | 59 | 0.0 |
| Dan Ortmeier | 2011-2011 | 0 | 1 | .000 | 3.38 | 1 | 0 | 0 | 0 | 0 | 5.3 | 3 | 2 | 0 | 4 | 0 | 0.3 |
| Franquelis Osoria | 2007-2016 | 17 | 26 | .395 | 5.09 | 270 | 0 | 0 | 0 | 35 | 327.3 | 392 | 185 | 47 | 130 | 137 | 17.3 |
| Antonio Osuna | 1996-2009 | 20 | 17 | .541 | 5.09 | 233 | 0 | 0 | 0 | 8 | 341.3 | 360 | 193 | 40 | 203 | 208 | 16.3 |
| Roy Oswalt | 2002-2015 | 101 | 78 | .564 | 3.97 | 276 | 255 | 13 | 1 | 2 | 1769.6 | 1738 | 780 | 177 | 525 | 1311 | 110.4 |
| Larry Ouimet | 2020-2021 | 1 | 3 | .250 | 4.80 | 45 | 0 | 0 | 0 | 0 | 65.7 | 71 | 35 | 0 | 42 | 53 | 2.1 |
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