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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 |
|---|---|---|---|---|---|---|---|---|---|
| Dylan O'Brien | 2017-2017 | .323 | 8 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Roark O'Brien | 2014-2014 | .000 | 0 | 0 | 1 | 0 | 9 | 1.64 | 50 |
| John O'Connor | 2012-2012 | .210 | 2 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Scott O'Connor | 2017-2017 | .270 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Ed O'Dwyer | 2017-2017 | .211 | 8 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Mackenzie O'Dwyer | 2015-2015 | .467 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Bernie O'Leary | 2016-2016 | .291 | 7 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Teagan O'Leary | 2012-2012 | .212 | 1 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Steve O'Neil | 2012-2012 | .351 | 9 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Neill | 2015-2015 | .000 | 0 | 0 | 4 | 2 | 2 | 6.92 | 37 |
| Richard O'Neill | 2013-2013 | .000 | 0 | 0 | 3 | 2 | 3 | 6.33 | 50 |
| Scott Oakes | 2017-2017 | .296 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Oger | 2014-2014 | .250 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Joël Oger | 2014-2014 | .352 | 22 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Hideyori Ohayashi | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Larry Ohler | 2016-2016 | .320 | 2 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Oldford | 2017-2017 | .243 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Augusto Olivares | 2018-2018 | .000 | 0 | 0 | 1 | 0 | 1 | 4.24 | 28 |
| Eric Oliver | 2012-2012 | .150 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Jeffrey Oliver | 2017-2017 | .333 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Mickael Olivier | 2015-2015 | .196 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Hang-fu Ong | 2017-2017 | .000 | 0 | 0 | 2 | 1 | 0 | 7.66 | 42 |
| Brandon Organ | 2017-2017 | .220 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Leif Ormon | 2014-2014 | .000 | 0 | 0 | 7 | 2 | 0 | 5.81 | 75 |
| Félix Orozco | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jonathan Orr | 2015-2015 | .319 | 5 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Ernesto Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2018-2018 | .315 | 7 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2018-2018 | .245 | 5 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Rodrigo Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Pete Osborn | 2016-2016 | .359 | 0 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Rich Ostrom | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Roy Ostrom | 2012-2012 | .365 | 7 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Al Otto | 2016-2016 | .346 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Oulton | 2013-2013 | .250 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Fei Ouyang | 2017-2017 | .083 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Szeto Ouyang | 2017-2017 | .000 | 0 | 0 | 3 | 0 | 1 | 7.56 | 27 |
| Ernie Owen | 2012-2012 | .242 | 3 | 16 | 0 | 0 | 0 | 0.00 | 0 |
