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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 | 2001-2001 | .000 | 0 | 0 | 0 | 1 | 0 | 2.40 | 10 |
| Brandon O'Neal | 2001-2001 | .227 | 1 | 4 | 7 | 7 | 0 | 3.64 | 105 |
| Chris O'Riordan | 2002-2002 | .000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Mark O'Sullivan | 2002-2002 | 1.000 | 0 | 0 | 0 | 0 | 1 | 6.12 | 35 |
| Paul O'Toole | 2003-2003 | .273 | 14 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Wes Obermueller | 2001-2001 | .143 | 1 | 2 | 2 | 0 | 0 | 2.73 | 18 |
| Ivan Ochoa | 2003-2003 | .241 | 5 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| P.J. Ochoa | 2002-2002 | .259 | 1 | 6 | 6 | 1 | 0 | 3.94 | 51 |
| Steven Oelke | 2002-2002 | .000 | 0 | 0 | 2 | 2 | 0 | 4.05 | 23 |
| John Ogiltree | 2003-2003 | .000 | 0 | 1 | 4 | 4 | 14 | 7.63 | 24 |
| Chad Oliva | 2003-2003 | .250 | 12 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Teuris Olivares | 2001-2001 | .231 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Brian Oliver | 2001-2001 | .320 | 4 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Oliveros | 2002-2003 | .254 | 12 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Olivo | 2002-2002 | .338 | 10 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Olore | 2001-2003 | .109 | 1 | 6 | 9 | 13 | 0 | 4.92 | 191 |
| Jason Olsen | 2002-2002 | .231 | 1 | 3 | 2 | 4 | 0 | 6.95 | 32 |
| Chris Olson | 2003-2003 | .256 | 7 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Eddie Olszta | 2002-2002 | .265 | 7 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Eric Ordorica | 2002-2003 | .267 | 10 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Nick Orlandos | 2002-2002 | .321 | 3 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Orloski | 2001-2001 | .000 | 0 | 0 | 6 | 7 | 0 | 3.25 | 56 |
| Carlos Ortega | 2001-2001 | .186 | 0 | 2 | 6 | 9 | 0 | 4.74 | 100 |
| Raul Ortega | 2003-2003 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Ortega | 2002-2002 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Javier J. Ortiz | 2001-2001 | .000 | 0 | 0 | 0 | 1 | 0 | 1.50 | 4 |
| Jose Ortiz | 2001-2001 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Luis Ortiz | 2001-2001 | .271 | 6 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Ortiz | 2002-2002 | .000 | 0 | 0 | 0 | 0 | 0 | 9.00 | 2 |
| Ian Ostlund | 2002-2002 | .000 | 0 | 0 | 0 | 0 | 0 | 5.23 | 14 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Hector Osuna | 2002-2002 | .262 | 6 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Paul Ottavinia | 2002-2002 | .080 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Brad Overton | 2003-2003 | .000 | 0 | 0 | 0 | 2 | 0 | 7.15 | 11 |
| Ryan Owen | 2003-2003 | .271 | 10 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Jerry Owens | 2003-2003 | .095 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
