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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Day, Ronald | SP | Fairbanks Grunts | 22 | 08/25/2017 | San Juan | PUR | Switch | Right | 6' 7" | 200 lbs | - |
| O'Halloran, Dan | SP | Wasilla Sledge Dogs | 20 | 11/13/2019 | Jersey City | USA | Right | Right | 6' 4" | 180 lbs | - |
| O'Neil, Malcolm | RF | Akutan Island Eagles | 19 | 10/26/2020 | Chino Hills | USA | Switch | Right | 6' 4" | 190 lbs | - |
| O'Neil, Rod | LF | Hilo Hoops | 19 | 09/16/2020 | Oklahoma City | USA | Left | Left | 6' 4" | 180 lbs | - |
| O'Quinn, Dave | LF | Hilo Hoops | 19 | 08/17/2020 | Honolulu | USA | Left | Right | 6' 2" | 180 lbs | - |
| Ohara, Atsushi | 2B | Waimalu Nene | 22 | 08/17/2017 | Tokyo | JPN | Right | Right | 6' 0" | 180 lbs | - |
| Ohara, Kenzo | LF | Osakasayama Swamp Dragons | 19 | 05/28/2020 | Tokyo | JPN | Left | Right | 5' 11" | 165 lbs | - |
| Ohayashi, Hidekazu | CF | Hilo Hoops | 19 | 12/12/2020 | Osaka | JPN | Right | Right | 6' 6" | 200 lbs | - |
| Ohayashi, Shoin | 2B | Kauai Monsters | 20 | 07/24/2019 | Yokohama | JPN | Right | Right | 6' 5" | 185 lbs | - |
| Ohayashi, Toshimichi | SP | Mokule'ia Oceanic | 20 | 05/08/2019 | Kochi | JPN | Right | Right | 6' 2" | 180 lbs | - |
| Ohayashi, Yasutoki | SP | Free Agent | 23 | 01/23/2017 | Neyagawa | JPN | Right | Left | 6' 2" | 195 lbs | - |
| Ohayashi, Yoshimi | 2B | Whitehorse Explorers | 19 | 11/12/2020 | Kunitachi | JPN | Switch | Right | 6' 4" | 200 lbs | - |
| Ojima, Kazunori | RF | Waimalu Nene | 22 | 10/14/2017 | Otsuchi | JPN | Left | Right | 6' 4" | 200 lbs | - |
| Ojima, Kosaku | RP | Shirakawa Halberds | 19 | 05/27/2020 | Tokorozawa | JPN | Right | Right | 6' 2" | 175 lbs | - |
| Okabe, Kuniaki | SP | Angoon Avalanche | 20 | 09/12/2019 | Iida | JPN | Right | Right | 6' 4" | 190 lbs | - |
| Okamoto, Naofumi | RP | Ewa Beach Imperialists | 23 | 05/26/2016 | Matsudo | JPN | Left | Left | 6' 4" | 180 lbs | - |
| Olivarez, Carlos | LF | Ketchikan Salmon | 22 | 09/29/2017 | Contramaestre | CUB | Left | Left | 6' 1" | 200 lbs | - |
| Olivarez, Mario | SS | Kailua Hanso | 23 | 09/05/2016 | Río Cauto | CUB | Right | Right | 6' 2" | 190 lbs | - |
| Onishi, Tetsuzan | RP | Shirakawa Halberds | 19 | 05/08/2020 | Tosashimizu | JPN | Right | Right | 6' 6" | 190 lbs | - |
| Ortíz, Bernardo | 2B | Waikiki Coconuts | 22 | 06/01/2017 | Sancti Spíritus | CUB | Left | Right | 6' 4" | 200 lbs | - |
| Ortíz, Cisco | LF | Free Agent | 20 | 04/16/2020 | Hopkinton | USA | Right | Right | 5' 11" | 165 lbs | - |
| Ortíz, Cris | 1B | Kobayashi Fireflies | 20 | 07/31/2019 | Arecibo | PUR | Right | Right | 6' 1" | 195 lbs | - |
| Ortíz, Cristián | RP | Hilo Hoops | 18 | 05/04/2021 | Riverside | USA | Right | Right | 6' 4" | 180 lbs | - |
| Ortíz, José | CF | Waikiki Coconuts | 21 | 09/10/2018 | Chinandega | NCA | Right | Right | 6' 0" | 180 lbs | - |
| Ortíz, Orlando | CL | Kailua Hanso | 21 | 03/06/2019 | Bayamo | CUB | Right | Right | 6' 8" | 200 lbs | - |
| Ortíz, Pedro | 3B | Hilo Hoops | 20 | 06/08/2019 | Sabanitas | PAN | Right | Right | 6' 3" | 200 lbs | - |
| Osborne, Ian | 3B | Ketchikan Salmon | 22 | 09/11/2017 | Brisbane | AUS | Right | Right | 6' 0" | 185 lbs | - |
| Otero, Wilson | RP | Anchorage Mighty Moose | 20 | 05/16/2019 | Santo Domingo | DOM | Switch | Right | 6' 2" | 185 lbs | - |
| Oyama, Norogumi | SP | Barrow Arctic Blast | 21 | 04/06/2019 | Okayama | JPN | Switch | Right | 6' 3" | 190 lbs | - |
