| ALPHABETICAL LISTING FOR: O |
| O'Day, Darren RP, Baltimore Orioles |
| O'Flaherty, Eric (DL) RP, Atlanta Braves |
| Odorizzi, Jake SP, Tampa Bay Rays |
| Ogando, Alexi (DL) SP, Texas Rangers |
| Okajima, Hideki RP, Oakland Athletics |
| Oliver, Darren RP, Toronto Blue Jays |
| Olivo, Miguel C, Miami Marlins |
| Omogrosso, Brian RP, Chicago White Sox |
| Ondrusek, Logan RP, Cincinnati Reds |
| Ortega, Jose RP, Detroit Tigers |
| Ortiz, David DH, Boston Red Sox |
| Ortiz, Joe RP, Texas Rangers |
| Ortiz, Ramon SP, Toronto Blue Jays |
| Ottavino, Adam RP, Colorado Rockies |
| Outman, Josh RP, Colorado Rockies |
| Overbay, Lyle 1B, New York Yankees |
| Oviedo, Juan Carlos (DL) RP, Tampa Bay Rays |
| Ozuna, Marcell RF, Miami Marlins |
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