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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 |
|---|---|---|---|---|---|---|---|---|---|
| Patrick O'Brien | 2001-2001 | .320 | 1 | 5 | 8 | 5 | 3 | 4.73 | 72 |
| Wes O'Brien | 2001-2001 | .000 | 0 | 0 | 3 | 6 | 2 | 3.60 | 30 |
| Brian O'Connor | 2001-2002 | .000 | 0 | 0 | 3 | 2 | 2 | 3.07 | 53 |
| Mike O'Connor | 2003-2003 | .087 | 0 | 0 | 2 | 8 | 0 | 4.92 | 57 |
| Ryan O'Malley | 2002-2003 | .282 | 2 | 12 | 7 | 7 | 0 | 4.34 | 98 |
| Steve Obenchain | 2003-2003 | .200 | 0 | 0 | 2 | 0 | 0 | 1.85 | 23 |
| Mark Obradovich | 2003-2003 | .250 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Trent Oeltjen | 2002-2002 | .240 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Ohme | 1993-1994 | .000 | 0 | 0 | 3 | 3 | 0 | 2.55 | 53 |
| Manuel Olivera | 2002-2003 | .226 | 1 | 6 | 8 | 10 | 0 | 5.12 | 142 |
| Jason Olsen | 2001-2001 | .000 | 0 | 0 | 0 | 1 | 0 | 3.86 | 6 |
| Kela Olsen | 2003-2003 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Olson | 2002-2002 | .222 | 0 | 0 | 0 | 5 | 0 | 3.43 | 74 |
| Ryan Olson | 2001-2003 | .000 | 0 | 0 | 5 | 4 | 2 | 3.16 | 166 |
| Tim Olson | 2001-2001 | .229 | 8 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Ontiveros | 2003-2003 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Willie Oropeza | 1997-2003 | .262 | 16 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Ortega | 2001-2002 | .200 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Edgar Ortiz | 2002-2002 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Javier J. Ortiz | 2003-2003 | .231 | 1 | 6 | 7 | 12 | 0 | 5.36 | 128 |
| Juan Ortiz | 1999-1999 | .159 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortiz | 2001-2001 | .346 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Ortiz | 2001-2001 | .095 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Ortmeier | 2002-2003 | .275 | 47 | 130 | 0 | 0 | 0 | 0.00 | 0 |
| Tanner Osberg | 2002-2003 | .196 | 0 | 3 | 6 | 8 | 0 | 4.15 | 108 |
| Pat Osborn | 2002-2003 | .379 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Donovan Osborne | 1990-1990 | .000 | 0 | 0 | 2 | 2 | 0 | 2.63 | 28 |
| Hector Osuna | 2001-2001 | .316 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Willis Otanez | 2001-2001 | .300 | 2 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Ricky Otero | 1992-2002 | .282 | 13 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Lyle Overbay | 2001-2001 | .225 | 4 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Overman | 2003-2003 | .500 | 0 | 0 | 1 | 0 | 0 | 5.25 | 8 |
| Jeremy Owens | 2001-2001 | .247 | 5 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Justin Owens | 2002-2002 | .222 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Oyervides | 2002-2003 | .242 | 0 | 3 | 3 | 5 | 0 | 5.45 | 78 |
| Todd Ozias | 2003-2003 | .000 | 0 | 0 | 2 | 1 | 5 | 3.98 | 23 |
| Pablo Ozuna | 1998-1998 | .357 | 9 | 62 | 0 | 0 | 0 | 0.00 | 0 |
