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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 | 0 | 0 | 0 | 3.38 | 25 |
| Lefty O'Doul | 2014-2014 | .275 | 24 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Flaherty | 2014-2014 | .000 | 0 | 0 | 3 | 1 | 0 | 3.55 | 32 |
| Buck O'Neil | 2014-2014 | .272 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Neill | 2014-2014 | .197 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Steve O'Neill | 2014-2014 | .190 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Blue Moon Odom | 2014-2014 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 3 |
| Jose Offerman | 2014-2014 | .250 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Alexi Ogando | 2014-2014 | .000 | 0 | 0 | 0 | 0 | 0 | 13.50 | 2 |
| Shohei Ohtani | 2014-2014 | .284 | 25 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Hideki Okajima | 2014-2014 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 3 |
| John Olerud | 2014-2014 | .353 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Oliva | 2014-2014 | .244 | 6 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Alejandro Oms | 2014-2014 | .280 | 25 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Jesse Orosco | 2014-2014 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 3 |
| Jorge Orta | 2014-2014 | .625 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| David Ortiz | 2014-2014 | .167 | 2 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Roy Oswalt | 2014-2014 | .000 | 0 | 0 | 0 | 0 | 0 | 3.38 | 4 |
| Amos Otis | 2014-2014 | .255 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Akinori Otsuka | 2014-2014 | .000 | 0 | 0 | 1 | 7 | 1 | 6.75 | 46 |
| Mel Ott | 2014-2014 | .228 | 15 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Carlos Oviedo | 2014-2014 | .000 | 0 | 0 | 2 | 0 | 1 | 1.89 | 33 |
| Spike Owen | 2014-2014 | .225 | 5 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Marcell Ozuna | 2014-2014 | .301 | 17 | 67 | 0 | 0 | 0 | 0.00 | 0 |
