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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sung-tae O | 2040-2040 | 2 | 0 | 1.000 | 2.45 | 7 | 0 | 0 | 0 | 0 | 7.1 | 7 | 2 | 1 | 1 | 11 |
| Rob O'Brien | 2042-2042 | 1 | 1 | .500 | 6.29 | 14 | 0 | 0 | 0 | 0 | 34.1 | 39 | 24 | 4 | 16 | 49 |
| Steve O'Fennaghty | 2035-2035 | 6 | 8 | .429 | 4.05 | 22 | 13 | 6 | 1 | 3 | 111.0 | 116 | 50 | 5 | 32 | 100 |
| Melvin O'Herlihy | 2032-2032 | 1 | 1 | .500 | 7.29 | 8 | 1 | 0 | 0 | 0 | 21.0 | 29 | 17 | 2 | 6 | 15 |
| Ray O'Morrisey | 2042-2042 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.1 | 0 | 0 | 0 | 0 | 0 |
| Wes O'Mulhill | 2033-2033 | 1 | 0 | 1.000 | 6.75 | 1 | 0 | 0 | 0 | 0 | 1.1 | 5 | 1 | 0 | 1 | 0 |
| Shane O'Toole | 2036-2036 | 0 | 2 | .000 | 2.61 | 19 | 0 | 0 | 0 | 9 | 20.2 | 18 | 6 | 4 | 6 | 21 |
| Sakutaro Ohayashi | 2032-2032 | 2 | 13 | .133 | 6.70 | 21 | 21 | 0 | 0 | 0 | 94.0 | 140 | 70 | 7 | 33 | 86 |
| Carlos Oilvares | 2040-2040 | 13 | 5 | .722 | 3.12 | 20 | 20 | 1 | 0 | 0 | 124.0 | 125 | 43 | 2 | 33 | 148 |
| Hidekazu Okawa | 2033-2034 | 2 | 2 | .500 | 4.40 | 15 | 3 | 1 | 0 | 0 | 45.0 | 51 | 22 | 3 | 19 | 40 |
| Josuke Okumura | 2038-2038 | 1 | 3 | .250 | 3.04 | 4 | 4 | 0 | 0 | 0 | 26.2 | 24 | 9 | 1 | 4 | 27 |
| Marc Olsen | 2037-2037 | 0 | 3 | .000 | 3.15 | 21 | 0 | 0 | 0 | 4 | 20.0 | 18 | 7 | 2 | 4 | 10 |
| Jaake Ooyendijk | 2039-2039 | 1 | 0 | 1.000 | 2.25 | 6 | 0 | 0 | 0 | 0 | 8.0 | 6 | 2 | 0 | 6 | 13 |
| Sergio Ordinario | 2035-2035 | 1 | 0 | 1.000 | 1.35 | 2 | 0 | 0 | 0 | 0 | 6.2 | 6 | 1 | 0 | 3 | 2 |
| Louis Orioli | 2041-2041 | 2 | 2 | .500 | 4.50 | 9 | 0 | 0 | 0 | 0 | 16.0 | 15 | 8 | 2 | 8 | 12 |
| Gerald Orlebar | 2032-2032 | 1 | 3 | .250 | 4.84 | 24 | 0 | 0 | 0 | 9 | 35.1 | 39 | 19 | 3 | 16 | 36 |
| Sasha Orlovsky | 2033-2035 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.1 | 0 | 0 | 0 | 0 | 1 |
| Luis Ornelas | 2042-2042 | 3 | 5 | .375 | 3.72 | 30 | 2 | 0 | 0 | 6 | 38.2 | 41 | 16 | 3 | 14 | 36 |
| Jorge Ortega | 2039-2040 | 3 | 0 | 1.000 | 0.92 | 4 | 4 | 0 | 0 | 0 | 19.2 | 13 | 2 | 0 | 10 | 16 |
| Ánibal Ortíz | 2032-2032 | 5 | 3 | .625 | 2.47 | 21 | 5 | 1 | 0 | 5 | 76.2 | 74 | 21 | 6 | 19 | 85 |
| Jesús Ortíz | 2037-2039 | 5 | 2 | .714 | 3.11 | 47 | 0 | 0 | 0 | 5 | 118.2 | 113 | 41 | 9 | 36 | 130 |
| Royce Ortíz | 2033-2033 | 0 | 3 | .000 | 6.75 | 5 | 0 | 0 | 0 | 0 | 13.1 | 23 | 10 | 2 | 4 | 8 |
| Orinosuke Oshiro | 2040-2040 | 3 | 7 | .300 | 4.48 | 14 | 12 | 0 | 0 | 0 | 76.1 | 89 | 38 | 2 | 18 | 81 |
