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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Rex O'Brian | 2026-2027 | .000 | 0 | 0 | 4 | 8 | 0 | 4.86 | 130 |
| Jim O'Brien | 2030-2031 | .388 | 53 | 175 | 0 | 0 | 0 | 0.00 | 0 |
| Rod O'Colgan Jr. | 2030-2032 | .000 | 0 | 0 | 14 | 2 | 0 | 2.77 | 230 |
| Hal O'Conelly | 2042-2045 | .329 | 25 | 154 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Connor | 2061-2065 | .000 | 0 | 0 | 6 | 9 | 6 | 4.58 | 111 |
| Dave O'Conor | 2046-2050 | .335 | 29 | 164 | 0 | 0 | 0 | 0.00 | 0 |
| Steve O'Cooney | 2027-2029 | .270 | 27 | 121 | 0 | 0 | 0 | 0.00 | 0 |
| Dylan O'Day | 2033-2035 | .416 | 51 | 183 | 0 | 0 | 0 | 0.00 | 0 |
| Greg O'Farrell | 2019-2021 | .000 | 0 | 0 | 9 | 2 | 19 | 3.23 | 88 |
| Phil O'Farrell | 2038-2041 | .000 | 0 | 0 | 6 | 7 | 0 | 6.76 | 142 |
| Nick O'Hara | 2051-2054 | .000 | 0 | 0 | 4 | 6 | 0 | 5.07 | 165 |
| Steve O'Hara | 2060-2063 | .000 | 0 | 0 | 7 | 3 | 10 | 2.69 | 92 |
| Steve O'Hara | 2067-2068 | .000 | 0 | 0 | 1 | 0 | 0 | 4.85 | 18 |
| Derek O'Hart | 2039-2041 | .372 | 36 | 139 | 0 | 0 | 0 | 0.00 | 0 |
| Ross O'Keeffe | 2064-2068 | .330 | 26 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Jay O'Malley | 2067-2068 | .241 | 14 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Horace O'Neill | 2043-2046 | .000 | 0 | 0 | 3 | 8 | 0 | 4.64 | 241 |
| Jude O'Neill | 2031-2033 | .000 | 0 | 0 | 8 | 3 | 4 | 6.08 | 158 |
| Vince O'Quin | 2053-2056 | .200 | 0 | 1 | 3 | 9 | 0 | 4.07 | 138 |
| Ken O'Reilly | 2050-2051 | .000 | 0 | 0 | 3 | 3 | 0 | 6.65 | 45 |
| Shawn O'Reilly | 2039-2042 | .000 | 0 | 0 | 20 | 11 | 3 | 7.41 | 197 |
| Ron O'Ronagne | 2048-2051 | .500 | 0 | 2 | 4 | 7 | 0 | 6.78 | 105 |
| Jeff O'Rourke | 2062-2065 | .260 | 13 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Don O'Scanlon | 2038-2041 | .354 | 35 | 175 | 0 | 0 | 0 | 0.00 | 0 |
| Justin O'Shea | 2068-2068 | .200 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Lou O'Slattery | 2038-2041 | .329 | 72 | 211 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Oakley | 2063-2066 | .268 | 0 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Adam Oaks | 2052-2055 | .000 | 0 | 0 | 4 | 3 | 0 | 6.34 | 88 |
| Ernesto Ochoa | 2034-2034 | .000 | 0 | 0 | 3 | 2 | 0 | 4.18 | 62 |
| Juan Ochoa | 2026-2028 | .349 | 22 | 119 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Seth Odom | 2065-2068 | .226 | 13 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Ody | 2068-2068 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mitsuru Ogawa | 2060-2063 | .000 | 0 | 0 | 6 | 11 | 0 | 4.56 | 154 |
| Mike Ogburn | 2068-2068 | .263 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jonathan Ogden | 2061-2065 | .270 | 4 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Meiji Ohayashi | 2039-2039 | .000 | 0 | 0 | 2 | 1 | 5 | 4.85 | 28 |
| Kazuya Okumura | 2051-2054 | .000 | 0 | 0 | 2 | 3 | 1 | 3.77 | 65 |
| Mike Olague | 2066-2067 | .000 | 0 | 0 | 1 | 1 | 5 | 2.45 | 35 |
| Ryan Oldenburg | 2051-2054 | .000 | 0 | 0 | 6 | 2 | 4 | 4.10 | 91 |
| Jim Oldford | 2068-2068 | .000 | 0 | 0 | 1 | 0 | 1 | 3.15 | 27 |
| Samuel Oldford | 2035-2037 | .000 | 0 | 0 | 3 | 7 | 1 | 6.08 | 71 |
| Jesús Oliva | 2047-2050 | .000 | 0 | 0 | 4 | 13 | 0 | 5.05 | 156 |
| Jesús Oliva | 2049-2052 | .000 | 0 | 0 | 2 | 6 | 0 | 5.61 | 109 |
| Cristián Oliveira | 2031-2033 | .000 | 0 | 0 | 8 | 2 | 9 | 3.83 | 132 |
| Erik Oliver | 2018-2020 | .000 | 0 | 0 | 15 | 7 | 0 | 3.02 | 153 |
| Luis Olivo | 2060-2064 | .000 | 0 | 0 | 5 | 6 | 7 | 6.36 | 111 |
| Sean Ollier | 2033-2035 | .249 | 17 | 101 | 0 | 0 | 0 | 0.00 | 0 |
| Allen Olsen | 2054-2057 | .000 | 0 | 0 | 6 | 5 | 0 | 3.28 | 149 |
| Jarrod Olszewski | 2068-2068 | .000 | 0 | 0 | 0 | 1 | 0 | 5.84 | 17 |
| Richard Olthof | 2062-2066 | .000 | 0 | 0 | 2 | 11 | 0 | 5.71 | 129 |
| Vinny Olvera | 2066-2068 | .130 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Will Onofre | 2051-2054 | .326 | 30 | 99 | 0 | 0 | 0 | 0.00 | 0 |
| Everett Onstott | 2056-2059 | .000 | 0 | 0 | 10 | 1 | 0 | 4.54 | 126 |
| Erjan Oprel | 2037-2038 | .283 | 22 | 95 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Opstad | 2029-2030 | .000 | 0 | 0 | 1 | 1 | 0 | 9.00 | 59 |
| Jose Ordonez | 2058-2062 | .259 | 8 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Edwin Orduno | 2052-2055 | .000 | 0 | 0 | 5 | 5 | 8 | 4.46 | 83 |
| Chris Oren | 2053-2056 | .273 | 10 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Orosco | 2055-2057 | .000 | 0 | 0 | 5 | 2 | 0 | 3.93 | 102 |
| Eric Orr | 2068-2068 | .188 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Justin Orr | 2059-2063 | .309 | 7 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Bobby Ortega | 2068-2068 | .346 | 9 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Ortega | 2056-2060 | .273 | 7 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ortega | 2048-2052 | .000 | 0 | 0 | 2 | 10 | 0 | 4.88 | 147 |
| Jesús Ortega | 2026-2028 | .000 | 0 | 0 | 16 | 6 | 0 | 3.19 | 280 |
| Jorge Ortega | 2026-2028 | .359 | 14 | 90 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Ortiz | 2059-2063 | .306 | 7 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Ortiz | 2056-2058 | .286 | 16 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Gus Ortiz | 2058-2062 | .205 | 12 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortiz | 2058-2062 | 1.000 | 0 | 0 | 7 | 7 | 0 | 4.95 | 186 |
| Andy Ortíz | 2047-2050 | .323 | 1 | 7 | 3 | 4 | 8 | 3.66 | 61 |
| José Ortíz | 2019-2020 | .000 | 0 | 0 | 3 | 7 | 12 | 5.40 | 55 |
| Juan Ortíz | 2038-2040 | .320 | 25 | 131 | 0 | 0 | 0 | 0.00 | 0 |
| Álex Ortíz | 2050-2054 | .000 | 0 | 0 | 6 | 6 | 0 | 4.34 | 196 |
| Jason Osborn | 2061-2065 | .300 | 31 | 115 | 0 | 0 | 0 | 0.00 | 0 |
| Nate Osborne | 2054-2057 | .000 | 0 | 0 | 8 | 2 | 0 | 4.55 | 134 |
| Adam Ostrander | 2059-2063 | .000 | 0 | 0 | 4 | 2 | 27 | 1.20 | 97 |
| Keith Oswald | 2064-2064 | .294 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| John Oswalt | 2068-2068 | .000 | 0 | 0 | 4 | 0 | 0 | 5.03 | 19 |
| Ernesto Otero | 2046-2049 | .000 | 0 | 0 | 11 | 2 | 1 | 2.88 | 217 |
| Feitze Ottens | 2032-2034 | .000 | 0 | 0 | 3 | 7 | 0 | 4.63 | 211 |
| Jon Otterson | 2059-2062 | .000 | 0 | 0 | 5 | 6 | 0 | 5.34 | 105 |
| John Otto | 2063-2067 | .321 | 13 | 75 | 0 | 0 | 0 | 0.00 | 0 |
| Charles Oude Nijhuis | 2035-2037 | .000 | 0 | 0 | 2 | 2 | 23 | 4.78 | 69 |
| Xuan-ling Ouyang | 2057-2061 | .000 | 0 | 0 | 6 | 4 | 1 | 3.24 | 147 |
| Kelvin Overdevest | 2049-2052 | .000 | 0 | 0 | 4 | 2 | 1 | 8.03 | 90 |
| Bill Overly | 2065-2066 | .000 | 0 | 0 | 1 | 1 | 0 | 3.20 | 18 |
| Robert Overstreet | 2062-2065 | .243 | 10 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Sean Owen | 2062-2066 | .000 | 0 | 0 | 12 | 5 | 0 | 5.18 | 130 |
| Chris Owens | 2052-2055 | .000 | 0 | 0 | 4 | 2 | 1 | 5.64 | 80 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Chris Owens | 2063-2067 | .268 | 11 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Ian Owens | 2017-2018 | .000 | 0 | 0 | 6 | 6 | 0 | 3.25 | 92 |
| Lance Owens | 2056-2058 | .000 | 0 | 0 | 1 | 2 | 0 | 2.51 | 119 |
| Phil Owens | 2029-2031 | .000 | 0 | 0 | 4 | 7 | 7 | 4.42 | 78 |
| Zane Owens | 2062-2066 | .000 | 0 | 0 | 5 | 2 | 0 | 10.12 | 73 |
