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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 |
|---|---|---|---|---|---|---|---|---|---|
| Mike O'Boyle | 2009-2011 | .308 | 0 | 3 | 4 | 10 | 0 | 4.93 | 97 |
| Kevin O'Brien | 2002-2004 | .075 | 0 | 0 | 4 | 6 | 0 | 4.54 | 116 |
| Marshall O'Brien | 2014-2017 | .264 | 2 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Connell | 2001-2001 | .270 | 12 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Wally O'Connell | 2006-2008 | .293 | 14 | 95 | 0 | 0 | 0 | 0.00 | 0 |
| Arlen O'Doherty | 2009-2011 | .221 | 10 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Kurt O'Donnell | 2013-2014 | .190 | 8 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Mark O'Hare | 2016-2017 | .304 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel O'Mara | 2005-2008 | .150 | 0 | 1 | 7 | 4 | 0 | 4.80 | 79 |
| Mike O'Neil | 2001-2001 | .250 | 0 | 0 | 3 | 3 | 3 | 5.92 | 49 |
| Dane O'Rourke | 2002-2004 | .271 | 0 | 7 | 16 | 8 | 0 | 3.44 | 210 |
| J.R. Oakley | 2011-2013 | .000 | 0 | 0 | 1 | 2 | 18 | 3.10 | 99 |
| Alex Ochoa | 2005-2005 | .000 | 0 | 0 | 2 | 0 | 1 | 7.45 | 17 |
| Mario Ochoa | 2005-2008 | .339 | 6 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Ochoa | 2009-2011 | .311 | 31 | 100 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Odekirk | 2005-2005 | .000 | 0 | 0 | 0 | 3 | 0 | 2.70 | 42 |
| Dave Ogden | 2005-2008 | .242 | 5 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Sam Oksanen | 2017-2017 | .107 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Olason | 2016-2017 | .000 | 0 | 2 | 5 | 2 | 0 | 2.39 | 76 |
| Marshall Olden | 2005-2005 | .500 | 0 | 1 | 1 | 1 | 0 | 6.15 | 21 |
| Josh Olds | 2004-2006 | .357 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Justin Oliver | 2001-2001 | .302 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Oliver | 2013-2016 | .251 | 8 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Nate Olshan | 2009-2011 | .000 | 0 | 0 | 3 | 2 | 29 | 1.55 | 84 |
| Andrew Olson | 2004-2006 | .186 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Sean Olson | 2016-2017 | .000 | 0 | 0 | 3 | 2 | 4 | 3.72 | 66 |
| Travis Olszewski | 2007-2009 | .000 | 0 | 0 | 6 | 3 | 2 | 4.26 | 83 |
| Justin Onder | 2007-2008 | .250 | 4 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Tim Ondik | 2017-2017 | .367 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Brady Orcutt | 2005-2005 | .125 | 0 | 2 | 1 | 2 | 0 | 4.34 | 34 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Scott Orozco | 2003-2005 | .378 | 4 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Willie Orozco | 2005-2005 | .237 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| John Orr | 2008-2010 | .185 | 1 | 3 | 3 | 5 | 0 | 5.87 | 80 |
| Angel Ortega | 2005-2007 | .212 | 1 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Edgar Ortega | 2017-2017 | .000 | 0 | 0 | 3 | 0 | 4 | 2.42 | 32 |
| Corey Ortiz | 2005-2005 | .253 | 6 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Manny Ortiz | 2012-2013 | .000 | 0 | 0 | 2 | 8 | 1 | 4.72 | 72 |
| Mike Ortiz | 2004-2005 | .000 | 0 | 0 | 2 | 2 | 1 | 3.10 | 30 |
| Josh Orwick | 2002-2004 | .267 | 11 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Osborn | 2007-2009 | .000 | 0 | 0 | 1 | 3 | 2 | 5.62 | 42 |
| Hector Osorio | 2011-2011 | .217 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Zack Ostling | 2004-2005 | .500 | 0 | 0 | 2 | 1 | 0 | 4.06 | 39 |
| Jim Ostrom | 2006-2007 | .062 | 0 | 0 | 2 | 1 | 0 | 2.37 | 52 |
| Doug Ostrow | 2016-2017 | .000 | 0 | 0 | 5 | 3 | 0 | 7.21 | 57 |
| Steve Oswald | 2017-2017 | .000 | 0 | 0 | 1 | 1 | 0 | 3.21 | 36 |
| Cameron Outlaw | 2012-2014 | .500 | 0 | 1 | 3 | 12 | 0 | 3.87 | 200 |
| Tyler Outlaw | 2010-2011 | .000 | 0 | 1 | 3 | 1 | 0 | 4.82 | 36 |
| Justin Overman | 2006-2008 | .042 | 0 | 1 | 5 | 8 | 0 | 3.53 | 182 |
| Jeremy Overton | 2003-2004 | .135 | 0 | 1 | 6 | 5 | 0 | 4.06 | 114 |
| Josh Owen | 2005-2005 | .000 | 0 | 0 | 0 | 3 | 0 | 5.36 | 31 |
| Matt Owen | 2005-2006 | .200 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Mason Owenby | 2017-2017 | .000 | 0 | 0 | 1 | 0 | 0 | 0.87 | 15 |
| Chris Owens | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 1 | 3.00 | 16 |
| Matt Owens | 2011-2014 | .195 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Peter Owens | 2014-2015 | .000 | 0 | 0 | 1 | 0 | 0 | 5.72 | 36 |
