| Home | Players | Teams | Leagues | Managers | Leaderboards | Win Shares | Awards | Help | |
| Pitching Registers: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | |
| "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 |
| Joseph O'Boyle | 2027-2029 | 17 | 18 | .486 | 4.57 | 55 | 54 | 4 | 2 | 1 | 326.7 | 356 | 166 | 32 | 75 | 155 | 15.6 |
| Conor O'Callaghan | 2029-2029 | 0 | 1 | .000 | 6.48 | 5 | 0 | 0 | 0 | 0 | 8.3 | 10 | 6 | 0 | 2 | 4 | 0.0 |
| Charles Oden | 2028-2029 | 0 | 1 | .000 | 8.85 | 21 | 0 | 0 | 0 | 0 | 20.3 | 32 | 20 | 4 | 10 | 5 | 0.0 |
| Michael Odom | 2000-2002 | 9 | 15 | .375 | 3.52 | 165 | 1 | 0 | 0 | 80 | 168.7 | 169 | 66 | 9 | 68 | 117 | 23.8 |
| Steven Odom | 2019-2029 | 30 | 39 | .435 | 4.74 | 657 | 0 | 0 | 0 | 21 | 630.0 | 680 | 332 | 41 | 363 | 283 | 24.8 |
| Shiro Ogusuku | 2025-2029 | 77 | 33 | .700 | 2.94 | 158 | 157 | 6 | 4 | 0 | 1014.7 | 1034 | 331 | 27 | 243 | 543 | 77.5 |
| Calderon Ojeda | 2018-2025 | 0 | 5 | .000 | 7.50 | 15 | 1 | 0 | 0 | 0 | 24.0 | 30 | 20 | 3 | 15 | 6 | 0.0 |
| Farruco Olayo | 2022-2027 | 14 | 17 | .452 | 4.66 | 161 | 2 | 0 | 0 | 5 | 220.3 | 245 | 114 | 27 | 77 | 77 | 13.2 |
| Iago Olazabal | 2027-2029 | 23 | 13 | .639 | 3.88 | 108 | 48 | 0 | 0 | 0 | 338.7 | 305 | 146 | 23 | 157 | 208 | 18.3 |
| Donny Olinger | 2024-2029 | 13 | 16 | .448 | 4.49 | 43 | 42 | 1 | 1 | 0 | 246.3 | 270 | 123 | 25 | 67 | 83 | 10.3 |
| Benito Oliveira | 2015-2026 | 59 | 72 | .450 | 4.31 | 286 | 154 | 8 | 1 | 6 | 1123.3 | 1147 | 538 | 81 | 438 | 497 | 38.6 |
| John Ollis | 2000-2006 | 1 | 0 | 1.000 | 3.00 | 1 | 0 | 0 | 0 | 0 | 3.0 | 2 | 1 | 0 | 3 | 1 | 0.5 |
| Albert Olmos | 2000-2014 | 176 | 174 | .503 | 3.55 | 500 | 495 | 85 | 22 | 0 | 3489.6 | 3283 | 1376 | 269 | 570 | 2479 | 187.1 |
| Joe O'Malley | 2003-2016 | 149 | 149 | .500 | 3.57 | 404 | 404 | 36 | 9 | 0 | 2718.6 | 2554 | 1077 | 283 | 675 | 1816 | 135.1 |
| Eddie Omar | 2000-2006 | 13 | 9 | .591 | 4.07 | 28 | 28 | 4 | 1 | 0 | 199.0 | 202 | 90 | 15 | 65 | 149 | 6.9 |
| John O'Parra | 2018-2021 | 7 | 14 | .333 | 4.68 | 30 | 25 | 0 | 0 | 1 | 138.3 | 159 | 72 | 21 | 29 | 55 | 3.2 |
| Leo Opitz | 2000-2001 | 0 | 0 | .000 | 13.53 | 2 | 0 | 0 | 0 | 0 | 1.3 | 3 | 2 | 0 | 1 | 3 | 0.2 |
| Gavin Ornelas | 2004-2006 | 4 | 1 | .800 | 4.57 | 58 | 0 | 0 | 0 | 4 | 67.0 | 75 | 34 | 9 | 9 | 43 | 4.2 |
| Harry Oropeza | 2028-2029 | 10 | 10 | .500 | 4.55 | 25 | 24 | 0 | 0 | 0 | 140.3 | 166 | 71 | 18 | 52 | 59 | 5.5 |
| Juan Ortega | 2023-2025 | 16 | 17 | .485 | 4.37 | 92 | 32 | 1 | 1 | 0 | 280.0 | 271 | 136 | 29 | 135 | 143 | 13.9 |
| Jason Orth | 2022-2029 | 16 | 30 | .348 | 4.67 | 63 | 58 | 6 | 0 | 0 | 370.3 | 378 | 192 | 36 | 175 | 145 | 12.6 |
| Ben Ortiz | 2011-2011 | 2 | 1 | .667 | 1.13 | 4 | 0 | 0 | 0 | 0 | 8.0 | 6 | 1 | 0 | 2 | 4 | 1.3 |
| Izek Ortiz | 2025-2029 | 17 | 18 | .486 | 4.38 | 296 | 0 | 0 | 0 | 16 | 351.0 | 377 | 171 | 37 | 106 | 172 | 17.8 |
| Joshua Orton | 2000-2004 | 24 | 22 | .522 | 4.32 | 67 | 65 | 9 | 2 | 0 | 446.0 | 470 | 214 | 53 | 150 | 278 | 12.7 |
| Thomas Orton | 2011-2011 | 1 | 0 | 1.000 | 4.50 | 1 | 0 | 0 | 0 | 0 | 2.0 | 1 | 1 | 0 | 2 | 0 | 0.3 |
| Dan Oster | 2000-2001 | 6 | 8 | .429 | 4.37 | 102 | 0 | 0 | 0 | 4 | 107.0 | 124 | 52 | 13 | 36 | 108 | 4.8 |
| Silverio Osuna | 2020-2029 | 93 | 109 | .460 | 3.86 | 375 | 282 | 8 | 3 | 1 | 1860.6 | 1990 | 799 | 200 | 216 | 824 | 92.6 |
| David Oughton | 2012-2021 | 24 | 33 | .421 | 4.77 | 181 | 70 | 4 | 1 | 1 | 585.0 | 598 | 310 | 70 | 254 | 181 | 7.4 |
| Ronnie Owens | 2000-2011 | 75 | 77 | .493 | 4.29 | 201 | 195 | 16 | 6 | 0 | 1302.0 | 1210 | 620 | 140 | 643 | 1226 | 47.9 |
29 Players | |||||||||||||||||
| For questions or to report errors, please send us a note. |