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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'Brien | 2016-2017 | .312 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Callahan | 2017-2017 | .000 | 0 | 0 | 4 | 3 | 3 | 3.86 | 36 |
| Chris O'Colgley | 2013-2015 | .359 | 6 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Dennis O'Connor | 2015-2016 | .293 | 10 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Ron O'Slattery | 2017-2017 | .000 | 0 | 0 | 1 | 0 | 0 | 7.91 | 29 |
| Floyd Oglethorpe | 2017-2017 | .000 | 0 | 0 | 5 | 5 | 0 | 7.40 | 67 |
| Brian Olivares | 2016-2017 | .250 | 3 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Cipriano Oliveira | 2017-2017 | .330 | 7 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Ormston | 2017-2017 | .270 | 3 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2015-2016 | .324 | 16 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Osborne | 2017-2017 | .308 | 9 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Owens | 2016-2016 | .297 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Doruk Oyan | 2016-2017 | .000 | 0 | 0 | 21 | 14 | 0 | 5.22 | 281 |
