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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 |
|---|---|---|---|---|---|---|---|---|---|
| Ju-hyung O | 2018-2018 | .000 | 0 | 0 | 1 | 0 | 0 | 4.55 | 44 |
| Jack O'Brien | 2019-2019 | .091 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Brien | 2016-2019 | .285 | 5 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Callahan | 2017-2020 | .000 | 0 | 0 | 17 | 15 | 3 | 4.25 | 225 |
| 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 |
| Christian O'Neal | 2018-2019 | .401 | 23 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron O'Neill | 2020-2020 | .000 | 0 | 0 | 3 | 7 | 16 | 4.80 | 17 |
| Ron O'Slattery | 2017-2019 | .000 | 0 | 0 | 8 | 12 | 0 | 6.76 | 160 |
| Floyd Oglethorpe | 2017-2018 | .000 | 0 | 0 | 7 | 13 | 0 | 7.60 | 113 |
| Brian Olivares | 2016-2017 | .250 | 3 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Cipriano Oliveira | 2017-2019 | .289 | 21 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Ontiveros | 2019-2020 | .351 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Ormston | 2017-2020 | .259 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ortega | 2020-2020 | .280 | 1 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Lorenzo Ortega | 2018-2019 | .000 | 0 | 0 | 2 | 6 | 16 | 8.13 | 20 |
| Alberto Ortíz | 2015-2020 | .322 | 16 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Ortíz | 2019-2019 | .266 | 5 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Osborne | 2017-2019 | .297 | 10 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Owens | 2016-2016 | .297 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Doruk Oyan | 2016-2018 | .000 | 0 | 0 | 25 | 21 | 0 | 5.79 | 333 |
