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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O, Chan-su | SS | Yeosu HS Porpoises | 16 | 10/01/2023 | Changwon | KOR | Switch | Right | 6' 4" | 180 lbs | - |
| O, Dong-hwan | RP | Canberra HS Mountaineers | 19 | 04/23/2021 | Taegu | KOR | Left | Right | 6' 2" | 175 lbs | - |
| O'brien, Cooper | SS | Hoorn Schooners | 18 | 03/30/2022 | Sydney | AUS | Right | Right | 6' 2" | 165 lbs | - |
| O'Kenny, Lysagh | CF | Dublin Shamrocks | 16 | 01/19/2024 | Dublin | IRL | Switch | Right | 6' 4" | 180 lbs | - |
| Ochoa, Andrés | CL | Guantanamo HS Diamond Cats | 16 | 08/22/2023 | Santiago de Cuba | CUB | Left | Left | 6' 3" | 180 lbs | - |
| Oda, Kiyonaga | 1B | Kochi HS Shogun | 17 | 04/21/2023 | Kanonji | JPN | Left | Right | 6' 1" | 195 lbs | - |
| Oda, Shuji | C | Port Lincoln HS Trawlers | 18 | 11/21/2021 | Nara | JPN | Left | Right | 6' 0" | 195 lbs | - |
| Odgers, Wesley | RF | Hunting Hills HS Stags | 16 | 12/03/2023 | Port Lincoln | AUS | Right | Left | 6' 6" | 200 lbs | - |
| Oeltjen, Ronald | RP | Port Lincoln HS Trawlers | 15 | 02/02/2025 | Port Lincoln | AUS | Right | Right | 6' 3" | 175 lbs | - |
| Oger, Guillaume | CL | Gonaives HS Revolution | 16 | 09/26/2023 | Port-au-Prince | HAI | Right | Right | 6' 3" | 180 lbs | - |
| Ohba, Mitsuhide | RF | Point Grey HS Hounds | 18 | 06/25/2021 | Akashi | JPN | Left | Right | 6' 2" | 180 lbs | - |
| Ok, Seong-rae | RF | Ulsan HS Flames | 17 | 02/08/2023 | Pusan | KOR | Left | Left | 6' 1" | 170 lbs | - |
| Okada, Masaki | SP | Lycee Fenelon Linguists | 18 | 11/08/2021 | Takamatsu | JPN | Left | Right | 6' 4" | 185 lbs | - |
| Okada, Yoshino | RP | Osaka Toin HS Eijisu Masters | 16 | 09/09/2023 | Sakai | JPN | Left | Left | 6' 0" | 170 lbs | - |
| Okamoto, Kiyohisa | RP | Hsinchu HS Shock | 18 | 12/28/2021 | Kyoto | JPN | Right | Right | 6' 5" | 190 lbs | - |
| Okamoto, Seika | RP | Montego Bay HS Mariners | 17 | 06/25/2022 | Kyoto | JPN | Right | Right | 6' 2" | 170 lbs | - |
| Okamura, Noriyori | RF | Chiben HS Namami Samurai | 16 | 02/01/2024 | Hiji | JPN | Left | Left | 6' 6" | 190 lbs | - |
| Okumura, Tokutomi | RP | Hildegard Saints | 18 | 05/29/2021 | Shizuoka | JPN | Right | Right | 6' 0" | 170 lbs | - |
| Okuta, Masaaki | CL | Kochi HS Shogun | 16 | 08/22/2023 | Matsuyama | JPN | Left | Right | 6' 9" | 200 lbs | - |
| Oliveira, Santiago | RP | Matanzas HS El Poeta | 15 | 12/18/2024 | Havana | CUB | Left | Left | 6' 3" | 180 lbs | - |
| Oliveras, Ninfa | RF | Manila HS Water Buffalo | 16 | 10/29/2023 | Santa Catalina Norte | PHI | Left | Left | 6' 2" | 180 lbs | - |
| Ollson, Benjamin | RP | Rockingham HS Settlers | 15 | 10/31/2024 | Perth | AUS | Right | Right | 5' 11" | 160 lbs | - |
| Olthof, Omer | RP | Hoorn Schooners | 15 | 01/18/2025 | Rijswijk | NED | Right | Right | 6' 3" | 170 lbs | - |
| Olthuis, Falco | RF | Kisarazu Sogo HS Ninja | 18 | 12/24/2021 | Rotterdam | NED | Right | Left | 6' 2" | 185 lbs | - |
| Onishi, Sadao | SP | Chiben HS Namami Samurai | 16 | 02/01/2024 | Kyoto | JPN | Right | Right | 6' 2" | 175 lbs | - |
| Ono, Hisamitsu | C | Sendai Ikuei HS Daimyo | 16 | 05/31/2023 | Sendai | JPN | Right | Right | 6' 1" | 185 lbs | - |
| Orr, Lewis | LF | Osaka Toin HS Eijisu Masters | 16 | 10/31/2023 | Jennings | USA | Left | Left | 5' 10" | 170 lbs | - |
| Ortíz, Pepe | RP | Guantanamo HS Diamond Cats | 15 | 01/18/2025 | Bayamo | CUB | Right | Right | 6' 6" | 190 lbs | - |
| Ortíz, Roberto | SP | San Felipe HS Spaniards | 16 | 08/26/2023 | Tamboril | DOM | Right | Right | 6' 2" | 175 lbs | - |
| Osborne, Axel | RP | Rockingham HS Settlers | 16 | 10/22/2023 | Perth | AUS | Right | Right | 5' 11" | 160 lbs | - |
| Osborne, Ian | 1B | Rockingham HS Settlers | 16 | 06/13/2023 | Perth | AUS | Right | Right | 6' 5" | 205 lbs | - |
| Osborne, Reed | SP | Immaculata HS Stallions | 16 | 04/29/2024 | Enderby | CAN | Right | Right | 5' 9" | 155 lbs | - |
| Oshima, Natsuo | CL | Sendai Ikuei HS Daimyo | 16 | 10/04/2023 | Shinjo | JPN | Left | Left | 6' 2" | 180 lbs | - |
| Ostrom, Frank | SP | Immaculata HS Stallions | 16 | 12/09/2023 | Kelowna | CAN | Left | Right | 6' 1" | 170 lbs | - |
| Otani, Nori | C | Lycee Fenelon Linguists | 19 | 04/27/2021 | Funabashi | JPN | Right | Right | 6' 2" | 200 lbs | - |
| Otsuka, Yaichiro | RP | Kisarazu Sogo HS Ninja | 16 | 10/20/2023 | Kamakura | JPN | Left | Left | 6' 8" | 205 lbs | - |
| Otto, Lou | SP | Hunting Hills HS Stags | 15 | 02/12/2025 | Edmonton | CAN | Right | Right | 6' 0" | 160 lbs | - |
| Ou, Xian | 2B | Taitung HS Hermits | 16 | 09/19/2023 | Tainan | TPE | Right | Right | 6' 1" | 160 lbs | - |
| Oyangoren, Nukie | RP | Manila HS Water Buffalo | 16 | 11/28/2023 | Manila | PHI | Right | Right | 5' 10" | 155 lbs | - |
| Ozaki, Taro | CF | Tokoha Gakuen Kikugawa HS Jiten | 16 | 10/01/2023 | Tsuru | JPN | Left | Right | 6' 1" | 170 lbs | - |
