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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 |
|---|---|---|---|---|---|---|---|---|---|
| Matt O'Brien | 2002-2002 | .000 | 0 | 0 | 0 | 1 | 0 | 3.46 | 12 |
| Wes O'Brien | 2001-2003 | .000 | 0 | 0 | 5 | 4 | 2 | 1.85 | 72 |
| Ryan O'Donnell | 2001-2001 | .257 | 3 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan O'Malley | 2002-2003 | .294 | 0 | 1 | 3 | 5 | 0 | 4.61 | 45 |
| Mark O'Sullivan | 2001-2001 | .000 | 0 | 0 | 1 | 2 | 1 | 4.59 | 42 |
| Paul O'Toole | 2002-2002 | .232 | 3 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Jerry Oakes | 2003-2003 | .000 | 0 | 0 | 2 | 0 | 0 | 4.56 | 18 |
| Mark Obradovich | 2003-2003 | .304 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Ocasio | 2002-2002 | .175 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Nehomar Ochoa | 2003-2003 | .222 | 0 | 0 | 1 | 3 | 0 | 3.38 | 20 |
| Steven Oelke | 2002-2002 | .133 | 0 | 1 | 4 | 2 | 0 | 3.52 | 46 |
| Chad Ogea | 2001-2001 | .273 | 0 | 5 | 4 | 4 | 0 | 3.91 | 64 |
| Travis Oglesby | 2001-2003 | .256 | 5 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Ruben Olguin | 2002-2002 | .130 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Chad Oliva | 2002-2002 | .232 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Reinaldo Olivari | 2001-2002 | .198 | 4 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Ray Olmedo | 2001-2003 | .271 | 18 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Walter Olmstead | 2002-2003 | .411 | 7 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Olore | 2003-2003 | .273 | 1 | 4 | 1 | 1 | 0 | 2.86 | 34 |
| Scott Olsen | 2002-2002 | .316 | 1 | 3 | 2 | 3 | 0 | 2.73 | 25 |
| Jason Olson | 2001-2001 | .150 | 0 | 0 | 3 | 3 | 0 | 4.24 | 32 |
| Jeff Ontiveros | 2002-2002 | .254 | 2 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Orlando Ortega | 2001-2002 | .000 | 0 | 0 | 6 | 2 | 1 | 3.81 | 58 |
| Jose Ortiz | 2003-2003 | .000 | 0 | 0 | 0 | 0 | 0 | 2.45 | 1 |
| Julio Ortiz | 2002-2002 | .000 | 0 | 0 | 2 | 0 | 0 | 7.11 | 14 |
| Patrick Ortiz | 2003-2003 | .234 | 7 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Pat Osborn | 2002-2002 | .217 | 4 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Mark Osborne | 2001-2002 | .304 | 4 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Franquelis Osoria | 2002-2002 | .400 | 0 | 1 | 1 | 1 | 0 | 4.15 | 10 |
| Gavin Osteen | 1989-1989 | .000 | 0 | 0 | 2 | 2 | 0 | 3.52 | 42 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Ricky Otero | 2002-2002 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Thom Ott | 2002-2002 | .333 | 0 | 0 | 0 | 1 | 0 | 1.29 | 15 |
| Juan Ovalles | 2003-2003 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Matt Overman | 2003-2003 | .000 | 0 | 0 | 0 | 0 | 0 | 0.93 | 7 |
| Justin Owens | 2002-2002 | .220 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Oxspring | 2001-2001 | .000 | 0 | 0 | 3 | 1 | 1 | 2.02 | 18 |
| Pedro Ozoria | 2003-2003 | .195 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
