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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Ogawa, Hitomaro | SP | Yokohama BayStars | 22 | 03/08/2022 | Kyoto | JPN | Right | Right | 6' 2" | 195 lbs | $1,500,000 |
| Ogawa, Kiyomori | SP | Chiba Marines | 33 | 12/08/2010 | Koshigaya | JPN | Right | Right | 6' 0" | 255 lbs | $1,955,000 |
| Ogawa, Tanzan | SP | Fukuoka Hawks | 24 | 10/25/2020 | Saito | JPN | Right | Right | 6' 0" | 195 lbs | - |
| Ogawa, Tsunesaburo | SP | Orix Buffaloes | 22 | 06/30/2022 | Fujisawa | JPN | Left | Right | 6' 2" | 195 lbs | - |
| Ohayashi, Kanko | LF | Chunichi Dragons | 38 | 02/16/2006 | Hashimoto | JPN | Left | Left | 6' 2" | 220 lbs | $170,000 |
| Ohayashi, Kenji | CF | Hanshin Tigers | 27 | 03/15/2017 | Fukui | JPN | Right | Left | 5' 11" | 190 lbs | $100,000 |
| Ohayashi, Takayuki | C | Yokohama BayStars | 23 | 10/13/2021 | Gifu | JPN | Right | Right | 5' 10" | 190 lbs | $100,000 |
| Ojeda, Carlos | MR | Yomiuri Giants | 36 | 12/30/2007 | Santo Domingo | DOM | Right | Right | 6' 3" | 255 lbs | $168,000 |
| Okamoto, Hisayuki | 1B | Chunichi Dragons | 29 | 02/10/2015 | Atami | JPN | Right | Right | 6' 1" | 205 lbs | $1,700,000 |
| Okamoto, Tsugiharu | 3B | Hanshin Tigers | 33 | 02/19/2011 | Soka | JPN | Switch | Right | 5' 11" | 240 lbs | $4,400,000 |
| Okubo, Tasuku | SP | Chunichi Dragons | 25 | 10/16/2019 | Onoda | JPN | Right | Right | 6' 4" | 220 lbs | $3,000,000 |
| Okuta, Nobuhito | CF | Yokohama BayStars | 28 | 03/05/2016 | Chiba | JPN | Right | Right | 5' 8" | 180 lbs | - |
| Okuta, Yoichibei | 1B | Saitama Lions | 32 | 06/01/2012 | Aizuwakamatsu | JPN | Right | Right | 6' 1" | 215 lbs | $2,200,000 |
| Omori, Joji | LF | Chiba Marines | 24 | 06/10/2020 | Shimminato | JPN | Right | Right | 6' 2" | 215 lbs | $3,200,000 |
| Ono, Ieyoshi | SP | Hanshin Tigers | 23 | 03/28/2021 | Honjo | JPN | Right | Right | 6' 4" | 215 lbs | - |
| Ono, Yoshinobu | 1B | Fukuoka Hawks | 28 | 04/08/2016 | Kure | JPN | Left | Left | 6' 0" | 230 lbs | $3,400,000 |
| Organ, Rodney | MR | Orix Buffaloes | 33 | 08/08/2011 | Toronto | CAN | Right | Right | 5' 11" | 220 lbs | $100,000 |
| Ortíz, Carlos | RF | Chunichi Dragons | 36 | 08/28/2008 | Minatitlan | MEX | Left | Left | 6' 1" | 235 lbs | $800,000 |
| Ota, Kawanari | 3B | Saitama Lions | 24 | 01/29/2020 | Higashikurume | JPN | Left | Right | 5' 11" | 195 lbs | - |
| Otani, Haranobu | SP | Fukuoka Hawks | 22 | 11/25/2021 | Toyooka | JPN | Right | Right | 5' 11" | 190 lbs | $100,000 |
| Oyama, Kenko | CF | Saitama Lions | 28 | 03/27/2016 | Yamato | JPN | Right | Right | 6' 1" | 230 lbs | - |
| Ozawa, Yasuhiro | MR | Saitama Lions | 24 | 01/09/2020 | Tsurugi | JPN | Right | Right | 6' 5" | 220 lbs | $360,000 |
