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| Monday, August 27th , 1888 |
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| Signed free agent 1B Diosdado bin Sameer to a minor league contract. |
| Thursday, August 23rd , 1888 |
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| RP Ishmael Olsen retired from professional baseball. |
| RP Ota Christensen retired from professional baseball. |
| 2B Rod Hudswell retired from professional baseball. |
| Tuesday, April 24th , 1888 |
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| Signed international amateur 3B Salomón Chavez out of Puerto Rico to a minor league contract. |
| Friday, February 24th , 1888 |
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| Signed Bench Coach Kirk Ball to a 3-year, P102 per year contract. |
| Signed Hitting Coach Guiomar Rivera to a 3-year, P171 per year contract. |
| Signed 1B Coach Severo Grazdani to a 3-year, P79 per year contract. |
| Signed 3B Coach Isamu Nakamura to a 3-year, P48 per year contract. |
| Thursday, February 23rd , 1888 |
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| Signed General Manager Ryan Kirby to a 3-year, P380 per year contract. |
| Signed Manager Oscar Castronova to a 5-year, P282 per year contract. |
| Signed Pitching Coach Cosme Walker to a 3-year, P160 per year contract. |
| Signed Scouting Director Vidal Rankovic to a 4-year, P201 per year contract. |
| Signed Team Trainer Vilen Knyazian to a 4-year, P86 per year contract. |
| Sunday, January 29th , 1888 |
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| SP Emérico Vargas joins the team. |
| SP Casimiro Valdes joins the team. |
| SP Aarón Perez joins the team. |
| RP Severo Espinoza joins the team. |
| RP Augurio Howard joins the team. |
| RP Buwono Nitisastro joins the team. |
| C Isiah Robinson joins the team. |
| C Acón Bustamante joins the team. |
| 1B Florián Otero joins the team. |
| 2B Esteban Moreira joins the team. |
| 3B Aristarco Smith joins the team. |
| SS Aarón Simmons joins the team. |
| LF Álvar Vega joins the team. |
| CF Justin Tart joins the team. |
| RF Arturo Montes joins the team. |
| 1B Xavier John joins the team. |
| 3B Erasmo Dorado joins the team. |
| 3B Aurelio Rodriguez joins the team. |
| 2B Abundio Minabe joins the team. |
| 2B Urayoán Flores joins the team. |
| LF Faustino Renteria joins the team. |
| RF Ambrosio Rabassa joins the team. |
| RF Augusto Enrique joins the team. |
| LF Joe McGee joins the team. |
| RF Bobby Coleman joins the team. |
| 1B Tito Colon joins the team. |
