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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bob O'Brien | 1996-2001 | 11 | 16 | .407 | 3.46 | 113 | 12 | 0 | 0 | 28 | 210.2 | 195 | 81 | 20 | 61 | 219 |
| Ryan O'Rourke | 1982-1988 | 24 | 13 | .649 | 2.34 | 184 | 0 | 0 | 0 | 30 | 277.1 | 219 | 72 | 16 | 122 | 306 |
| Denny O'Toole | 1984-1990 | 4 | 2 | .667 | 4.00 | 42 | 1 | 0 | 0 | 2 | 78.2 | 86 | 35 | 7 | 19 | 82 |
| Jake Odorizzi | 1989-1998 | 26 | 27 | .491 | 3.47 | 80 | 80 | 11 | 4 | 0 | 511.2 | 475 | 197 | 28 | 130 | 547 |
| Omar Olivares | 1980-1980 | 1 | 1 | .500 | 3.18 | 2 | 2 | 2 | 0 | 0 | 17.0 | 13 | 6 | 3 | 1 | 19 |
| Lester Oliveros | 1985-1985 | 2 | 0 | 1.000 | 1.47 | 10 | 0 | 0 | 0 | 1 | 18.1 | 13 | 3 | 1 | 6 | 15 |
| Kevin Olsen | 1991-1993 | 1 | 1 | .500 | 4.72 | 33 | 2 | 0 | 0 | 4 | 76.1 | 84 | 40 | 4 | 35 | 94 |
| Ole Olsen | 1994-1995 | 10 | 6 | .625 | 3.64 | 75 | 15 | 0 | 0 | 2 | 178.0 | 171 | 72 | 15 | 50 | 219 |
| Scott Olsen | 1980-1983 | 1 | 0 | 1.000 | 2.59 | 13 | 0 | 0 | 0 | 0 | 24.1 | 19 | 7 | 1 | 13 | 30 |
| Vern Olsen | 1997-1999 | 11 | 5 | .688 | 2.23 | 24 | 23 | 0 | 0 | 1 | 129.1 | 109 | 32 | 6 | 26 | 167 |
| Garrett Olson | 1988-1989 | 11 | 9 | .550 | 4.90 | 62 | 27 | 0 | 0 | 0 | 192.2 | 230 | 105 | 21 | 48 | 205 |
| Reese Olson | 1992-1998 | 73 | 62 | .541 | 3.86 | 187 | 159 | 44 | 8 | 1 | 1202.0 | 1211 | 515 | 96 | 396 | 1293 |
| Tyler Olson | 1983-1986 | 10 | 7 | .588 | 3.43 | 125 | 0 | 0 | 0 | 19 | 188.2 | 161 | 72 | 12 | 58 | 224 |
| Ed Olwine | 1997-1999 | 6 | 16 | .273 | 5.53 | 52 | 29 | 0 | 0 | 0 | 184.0 | 225 | 113 | 33 | 49 | 154 |
| Brian Omogrosso | 1988-1994 | 8 | 10 | .444 | 4.61 | 170 | 8 | 0 | 0 | 10 | 312.2 | 341 | 160 | 26 | 112 | 295 |
| Jesse Orosco | 1999-2001 | 21 | 5 | .808 | 2.69 | 117 | 0 | 0 | 0 | 22 | 197.1 | 163 | 59 | 14 | 100 | 229 |
| Anthony Ortega | 2001-2001 | 9 | 9 | .500 | 6.67 | 23 | 21 | 1 | 0 | 1 | 118.2 | 160 | 88 | 17 | 62 | 76 |
| Phil Ortega | 1993-1996 | 35 | 11 | .761 | 2.26 | 60 | 59 | 3 | 3 | 0 | 398.0 | 307 | 100 | 19 | 84 | 512 |
| Baby Ortiz | 1990-1993 | 20 | 18 | .526 | 6.20 | 102 | 62 | 0 | 0 | 0 | 348.1 | 488 | 240 | 31 | 110 | 205 |
| Luis Ortiz | 1991-1997 | 16 | 30 | .348 | 3.01 | 276 | 2 | 0 | 0 | 26 | 505.1 | 462 | 169 | 19 | 158 | 484 |
| Bob Osborn | 1998-2001 | 30 | 19 | .612 | 3.46 | 119 | 64 | 0 | 0 | 20 | 452.1 | 397 | 174 | 31 | 145 | 408 |
| Pat Osburn | 1999-2001 | 7 | 11 | .389 | 4.62 | 52 | 35 | 0 | 0 | 0 | 216.0 | 238 | 111 | 20 | 111 | 175 |
| Charlie Osgood | 1997-2001 | 39 | 46 | .459 | 4.79 | 153 | 112 | 1 | 0 | 4 | 601.1 | 603 | 320 | 73 | 242 | 445 |
| Bill Oster | 1984-1986 | 13 | 6 | .684 | 4.55 | 109 | 0 | 0 | 0 | 4 | 221.2 | 260 | 112 | 7 | 85 | 140 |
| Antonio Osuna | 1987-1995 | 57 | 46 | .553 | 2.83 | 319 | 28 | 6 | 1 | 80 | 728.0 | 657 | 229 | 47 | 223 | 916 |
| Dave Otto | 1994-2001 | 29 | 23 | .558 | 2.91 | 135 | 36 | 11 | 4 | 11 | 467.1 | 433 | 151 | 15 | 116 | 508 |
| Mike Overy | 1981-1987 | 24 | 10 | .706 | 3.17 | 203 | 2 | 0 | 0 | 18 | 409.1 | 360 | 144 | 37 | 119 | 437 |
| Johan Oviedo | 1993-2000 | 60 | 42 | .588 | 3.42 | 126 | 126 | 8 | 3 | 0 | 816.1 | 699 | 310 | 37 | 287 | 939 |
