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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 |
|---|---|---|---|---|---|---|---|---|---|
| Mark O'Brien | 2040-2040 | .000 | 0 | 0 | 0 | 0 | 0 | 5.59 | 7 |
| Dax O'Mannis | 2024-2025 | .293 | 56 | 144 | 0 | 0 | 0 | 0.00 | 0 |
| Keith O'Neal | 2042-2042 | .384 | 5 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Earl O'Quinn | 2028-2035 | .234 | 70 | 284 | 0 | 0 | 0 | 0.00 | 0 |
| Christian O'Rorke | 2035-2036 | .205 | 13 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Shigekazu Ogawa | 2024-2027 | .273 | 9 | 102 | 0 | 0 | 0 | 0.00 | 0 |
| Kieran Ogg | 2039-2042 | .000 | 0 | 0 | 26 | 31 | 5 | 3.42 | 448 |
| Jesse Oglethorpe | 2038-2040 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kadidu Ogola | 2038-2038 | .250 | 1 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshifumi Ohara | 2029-2034 | .067 | 0 | 0 | 25 | 32 | 64 | 3.63 | 456 |
| Seitaro Ohayashi | 2040-2042 | .236 | 30 | 100 | 0 | 0 | 0 | 0.00 | 0 |
| Yaichiro Ohayashi | 2036-2037 | .000 | 0 | 0 | 3 | 6 | 0 | 2.94 | 38 |
| Yoshiaga Ohayashi | 2024-2028 | .078 | 0 | 3 | 38 | 18 | 6 | 3.51 | 407 |
| Noboru Oike | 2039-2040 | .000 | 0 | 0 | 6 | 7 | 0 | 4.20 | 90 |
| Nori Oike | 2024-2024 | .203 | 4 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Hyobe Ojima | 2024-2032 | .259 | 169 | 528 | 0 | 0 | 0 | 0.00 | 0 |
| Shigetoki Okamoto | 2036-2038 | .000 | 0 | 0 | 11 | 7 | 0 | 3.68 | 128 |
| Toshiro Okamoto | 2024-2024 | .196 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Nobuharu Okamura | 2024-2024 | .000 | 0 | 1 | 4 | 4 | 3 | 4.12 | 32 |
| Sumiteru Okamura | 2042-2042 | .000 | 0 | 0 | 6 | 3 | 0 | 3.75 | 70 |
| Katsumi Okano | 2024-2024 | .000 | 0 | 0 | 1 | 5 | 0 | 6.44 | 33 |
| Mito Okuda | 2038-2039 | .000 | 0 | 0 | 2 | 4 | 0 | 3.67 | 21 |
| Tsuneari Okuta | 2039-2042 | .208 | 21 | 114 | 0 | 0 | 0 | 0.00 | 0 |
| Víctor Oliver | 2042-2042 | .000 | 0 | 0 | 3 | 2 | 0 | 3.46 | 38 |
| Sam Olson | 2039-2042 | .245 | 60 | 246 | 0 | 0 | 0 | 0.00 | 0 |
| Masujiro Onishi | 2024-2026 | .049 | 1 | 4 | 15 | 14 | 0 | 4.60 | 160 |
| Atsushi Ono | 2035-2042 | .267 | 150 | 450 | 0 | 0 | 0 | 0.00 | 0 |
| Shigeaki Ono | 2024-2025 | .125 | 0 | 2 | 5 | 12 | 2 | 5.40 | 150 |
| Yoshi Ono | 2024-2027 | .083 | 0 | 0 | 12 | 17 | 6 | 3.34 | 186 |
| Adam Opie | 2041-2041 | .000 | 0 | 0 | 0 | 0 | 0 | 4.35 | 8 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jorge Ornelas | 2024-2025 | .256 | 19 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Orozco | 2039-2042 | .254 | 14 | 119 | 0 | 0 | 0 | 0.00 | 0 |
| Sixto Ortega | 2040-2040 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Gabriel Ortíz | 2033-2040 | .247 | 17 | 124 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2037-2042 | .000 | 0 | 0 | 73 | 70 | 0 | 3.37 | 1024 |
| José Ortíz | 2041-2041 | .000 | 0 | 0 | 0 | 0 | 0 | 3.86 | 2 |
| Juan Ortíz | 2039-2042 | .000 | 0 | 0 | 14 | 17 | 11 | 3.67 | 209 |
| Júlio Ortíz | 2025-2025 | .000 | 0 | 0 | 1 | 0 | 2 | 4.97 | 7 |
| Nelson Ortíz | 2024-2024 | .000 | 0 | 0 | 3 | 1 | 0 | 3.79 | 31 |
| Kitahachi Osawa | 2027-2030 | .080 | 0 | 0 | 8 | 9 | 23 | 3.21 | 147 |
| Vern Osborne | 2039-2042 | .000 | 0 | 0 | 20 | 15 | 1 | 2.67 | 252 |
| Calvin Oster | 2040-2040 | .667 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| James Ostrander | 2035-2035 | .000 | 0 | 0 | 4 | 3 | 1 | 3.03 | 76 |
| Juan Otero | 2042-2042 | .000 | 0 | 0 | 3 | 5 | 17 | 4.12 | 61 |
| Kunitaro Otsuka | 2024-2027 | .111 | 0 | 0 | 3 | 4 | 0 | 5.33 | 56 |
| Matthias Ouellette | 2026-2041 | .249 | 79 | 268 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Owens | 2028-2028 | .198 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Norogumi Oyama | 2042-2042 | .000 | 0 | 0 | 0 | 0 | 0 | 13.50 | 2 |
| Takeji Oyama | 2034-2035 | .213 | 6 | 39 | 0 | 0 | 0 | 0.00 | 0 |
