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| Saturday, September 19th , 1903 |
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| 3B Adalberto Beltrán retired from professional baseball. |
| Monday, July 27th , 1903 |
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| Signed free agent RP Ángel Aldama to a 1-year contract worth a total of P880. |
| Monday, July 20th , 1903 |
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| Traded 30-year old RHP Celedonio Soto to the Patillas Cuervos, getting 21-year old RHP Duarte Flores, 23-year old C Miguel del Carmen, and 19-year old C Noé Esquivel in return. |
| Monday, July 13th , 1903 |
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| Traded 28-year old RHP Rafael Veitia, 23-year old RHP Esteban Núñez, and 22-year old RHP Matías Sousa to the Adjuntas Santos, getting 16-year old RF Roberto Rivera in return. |
| Wednesday, May 27th , 1903 |
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| Activated C Jesús Henao from the injured list. |
| Friday, May 8th , 1903 |
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| Placed C Jesús Henao on the 10-day injured list, retroactive to 05/05/1903. |
| Wednesday, April 29th , 1903 |
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| Signed free agent CF Fidel Aguilar to a 1-year contract worth a total of P1,020. |
| Wednesday, April 1st , 1903 |
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| Traded 30-year old CF Polideuco Vargas to the Guayama Hechiceros, getting 22-year old LHP Honesto Martínez in return. |
| Monday, March 30th , 1903 |
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| Traded 30-year old C Bob Corrigan to the Juana Diaz Reyes, getting 22-year old RHP Matías Sousa in return. |
| Monday, March 23rd , 1903 |
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| Signed free agent C Jesús Henao to a 1-year contract worth a total of P790. |
| Monday, March 16th , 1903 |
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| Traded 31-year old LF Bannon Quinton and 22-year old RF Wilfredo Hernández to the Loiza Vejigantes, getting 22-year old RHP Ramiro Herrera in return. |
| Monday, March 9th , 1903 |
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| Signed free agent 2B Daniel Barajas to a 1-year contract worth a total of P790. |
| Signed free agent 3B Jorge Telles to a 1-year contract worth a total of P680. |
| Tuesday, February 24th , 1903 |
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| Traded 37-year old 3B Gualberto Velásquez and 19-year old RHP Ángel Olivo to the Arecibo Lobos, getting 22-year old RF Wilfredo Hernández and 21-year old C Tito Camacho in return. |
| Tuesday, January 27th , 1903 |
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| Signed free agent RP Benjamín Cedillo to a 1-year contract worth a total of P1,560. |
| Tuesday, January 20th , 1903 |
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| Signed free agent RP Laureano Rodríguez to a 1-year contract worth a total of P930. |
