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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| O'Brien, Casey | RP | Houston Trade School Rapids | 15 | 12/01/1943 | Arlington | USA | Switch | Left | 6' 0" | 165 lbs | - |
| O'Brien, Glen | RP | Toronto High School Pilots | 18 | 11/01/1940 | Newtownards | NIR | Right | Right | 6' 4" | 190 lbs | - |
| O'Brien, Jordan | RP | Aruba Central High School Barons | 17 | 10/24/1941 | Santa Cruz | ARU | Left | Left | 6' 3" | 175 lbs | - |
| O'Donnell, Jeff | SP | Adams Academy Copperheads | 15 | 05/30/1943 | Vaughan | CAN | Right | Right | 5' 10" | 160 lbs | - |
| Oatman, Óscar | SS | Oceanview High School Triplets | 19 | 03/16/1940 | Caracas | VEN | Right | Right | 6' 0" | 155 lbs | - |
| Obidos, Hans | 2B | Long Beach High School Voyagers | 18 | 08/03/1940 | Alfena | POR | Right | Right | 5' 10" | 160 lbs | - |
| Ocampo, Edgar | CL | St. Dominic's High School Mountain Cats | 17 | 08/21/1941 | Maracaibo | VEN | Right | Right | 6' 3" | 180 lbs | - |
| Ochoa, Antonio | SP | Juan Martinez Trade School Klondikes | 19 | 12/27/1939 | San José | CRC | Right | Right | 6' 3" | 190 lbs | - |
| Ochoa, Oscar | RP | Johnston Institute Battle Kings | 18 | 08/30/1940 | Mexico City | MEX | Right | Right | 6' 1" | 180 lbs | - |
| Odano, Ryouhei | C | District Charter School Volts | 17 | 03/19/1942 | Yokohama | JPN | Right | Right | 6' 2" | 180 lbs | - |
| Ogawa, Yukinori | RP | District Charter School Volts | 17 | 01/06/1942 | Miyazaki | JPN | Left | Left | 6' 1" | 175 lbs | - |
| Ohira, Masaichi | LF | Sleepy Hollow High School Horsemen | 18 | 08/14/1940 | Gifu | JPN | Switch | Left | 5' 10" | 165 lbs | - |
| Ohta, Kuzuya | SP | District Charter School Volts | 15 | 12/07/1943 | Kawasaki | JPN | Right | Left | 6' 2" | 175 lbs | - |
| Oka, Itsuki | LF | Providence High School Loggers | 15 | 06/26/1943 | Fukuoka | JPN | Right | Right | 5' 11" | 160 lbs | - |
| Oka, Michinori | SS | District Charter School Volts | 17 | 03/22/1942 | Musashino | JPN | Switch | Right | 6' 0" | 155 lbs | - |
| Okuda, Ken | 2B | District Charter School Volts | 16 | 01/11/1943 | Yokohama | JPN | Switch | Right | 5' 9" | 155 lbs | - |
| Olalde, Juan | SP | Sakura Prep Swordsmen | 16 | 06/24/1942 | Boca Chica | DOM | Left | Left | 6' 3" | 185 lbs | - |
| Olivar, Bryant | 1B | Baltimore High School Cavaliers | 19 | 03/07/1940 | Detroit | USA | Left | Left | 6' 2" | 190 lbs | - |
| Olivares, Jorge | SS | Montgomery High School Dinos | 19 | 03/30/1940 | Pembroke Pines | USA | Right | Right | 6' 0" | 165 lbs | - |
| Ollervides, Eduardo | RF | Montgomery High School Dinos | 17 | 04/23/1942 | Mexico City | MEX | Right | Right | 6' 0" | 170 lbs | - |
| Olson, Corey | 3B | Sleepy Hollow High School Horsemen | 15 | 07/05/1943 | West Lafayette | USA | Right | Right | 6' 0" | 165 lbs | - |
| Olsson, Christian | LF | Athens High School Angels | 17 | 05/24/1941 | Hudiksvall | SWE | Right | Right | 6' 2" | 175 lbs | - |
| Omeragic, Milojica | RP | Harlem High School Wild Dogs | 17 | 03/19/1942 | El Cajon | USA | Left | Left | 6' 0" | 165 lbs | - |
| Ono, Sadayuki | SP | Sakura Prep Swordsmen | 15 | 10/04/1943 | Tochigi | JPN | Right | Right | 6' 2" | 175 lbs | - |
| Oostendorp, Markus | 3B | Amsterdam Secondary Bluebirds | 15 | 09/27/1943 | Bergen op Zoom | NED | Right | Right | 5' 11" | 160 lbs | - |
| Orozco, Albert | LF | Barcelona High School Gators | 15 | 05/26/1943 | Chiclana | ESP | Right | Right | 5' 11" | 175 lbs | - |
| Orozco, Bert | SP | Montgomery High School Dinos | 16 | 10/27/1942 | Zapotlanejo | MEX | Right | Right | 6' 0" | 165 lbs | - |
| Orozco, Mario | C | San Juan High School Surf | 18 | 09/18/1940 | Cabo Rojo | PUR | Right | Right | 6' 0" | 170 lbs | - |
| Orrell, Jim | 1B | Washington DC High School Robins | 18 | 03/29/1941 | Portland | USA | Right | Right | 5' 11" | 165 lbs | - |
| Ortiz, Alejandro | SS | St. Pierre Prep Golden Gophers | 16 | 01/06/1943 | Greater Carrollwood | USA | Right | Right | 5' 11" | 160 lbs | - |
| Ortiz, Keith | RP | Portland Central High School Swamp Bats | 17 | 02/16/1942 | Newport Beach | USA | Right | Left | 5' 11" | 165 lbs | - |
| Ortiz, Luis | RP | Dutch International School Aqua Sox | 18 | 06/13/1940 | Willemstad | CUR | Right | Right | 5' 10" | 160 lbs | - |
| Osborn, Bob | 1B | Adams Academy Copperheads | 17 | 10/02/1941 | Shawville | CAN | Left | Left | 6' 0" | 175 lbs | - |
| Osborne, Eric | C | Chicago High School Waves | 16 | 10/12/1942 | Moreno Valley | USA | Right | Right | 5' 10" | 165 lbs | - |
| Osborne, Kevin | RF | American International School Argonauts | 16 | 10/25/1942 | Orleans | USA | Switch | Left | 6' 3" | 185 lbs | - |
| Osborne, Rafael | 1B | American International School Argonauts | 17 | 11/09/1941 | Melbourne | AUS | Right | Right | 6' 3" | 190 lbs | - |
| Ostrom, Matt | 1B | Toronto High School Pilots | 15 | 11/24/1943 | Spruce Grove | CAN | Right | Right | 5' 11" | 170 lbs | - |
| Otazu, Felino | 1B | Washington DC High School Robins | 17 | 04/23/1942 | Manila | PHI | Left | Left | 6' 0" | 175 lbs | - |
| Otomo, Takanobu | SP | Tokyo Central High School Sky Chiefs | 16 | 08/01/1942 | Shimonoseki | JPN | Right | Right | 5' 11" | 160 lbs | - |
| Otsu, Michinaga | 1B | Greenwich Secondary Devils | 14 | 05/27/1944 | Saitama | JPN | Right | Right | 5' 10" | 165 lbs | - |
| Overton, Mike | 2B | Charlotte High School Atlantics | 19 | 04/11/1940 | Tooele | USA | Right | Right | 6' 0" | 170 lbs | - |
| Overton, Tris | RF | Johnston Institute Battle Kings | 15 | 05/10/1943 | Drexel Hill | USA | Left | Left | 5' 8" | 155 lbs | - |
| Ozaki, Shikato | 1B | Sakura Prep Swordsmen | 18 | 04/07/1941 | Kamagaya | JPN | Right | Right | 6' 1" | 175 lbs | - |
