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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 |
|---|---|---|---|---|---|---|---|---|---|
| Darren O'Day | 2014-2014 | .000 | 0 | 0 | 1 | 1 | 1 | 6.23 | 28 |
| Lefty O'Doul | 2014-2014 | .270 | 20 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Flaherty | 2014-2014 | .000 | 0 | 0 | 1 | 1 | 0 | 2.65 | 33 |
| Paul O'Neill | 2014-2014 | .264 | 12 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Blue Moon Odom | 2014-2014 | .000 | 0 | 0 | 1 | 0 | 0 | 8.31 | 13 |
| Jose Offerman | 2014-2014 | .275 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Alexi Ogando | 2014-2014 | .000 | 0 | 0 | 0 | 0 | 0 | 1.08 | 4 |
| Shohei Ohtani | 2014-2014 | .257 | 42 | 119 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Ojeda | 2014-2014 | .000 | 0 | 0 | 0 | 0 | 0 | 1.88 | 8 |
| Hideki Okajima | 2014-2014 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 7 |
| John Olerud | 2014-2014 | .270 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Oliva | 2014-2014 | .245 | 15 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Gregg Olson | 2014-2014 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 3 |
| Magglio Ordonez | 2014-2014 | .225 | 3 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Jesse Orosco | 2014-2014 | .000 | 0 | 0 | 1 | 0 | 0 | 3.19 | 36 |
| Jorge Orta | 2014-2014 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| David Ortiz | 2014-2014 | .200 | 10 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Roy Oswalt | 2014-2014 | .000 | 0 | 0 | 1 | 0 | 0 | 3.97 | 26 |
| Amos Otis | 2014-2014 | .229 | 4 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Akinori Otsuka | 2014-2014 | .000 | 0 | 0 | 3 | 10 | 5 | 3.23 | 58 |
| Mel Ott | 2014-2014 | .274 | 24 | 92 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Carlos Oviedo | 2014-2014 | .000 | 0 | 0 | 1 | 1 | 0 | 4.65 | 27 |
| Spike Owen | 2014-2014 | .239 | 7 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Marcell Ozuna | 2014-2014 | .249 | 30 | 83 | 0 | 0 | 0 | 0.00 | 0 |
