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| Saturday, September 19th , 1903 |
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| SP Dan Klockow retired from professional baseball. |
| Monday, August 31st , 1903 |
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| Signed free agent SP Luis Bernal to a 1-year contract worth a total of P2,580. |
| Thursday, July 23rd , 1903 |
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| Traded 31-year old C Valerio Delgado to the Aguada Arzobispos, getting 24-year old SS Dennis Perry in return. |
| Traded 28-year old 1B Hermenegildo Cativo to the Guaynabo Libertadores, getting 34-year old 2B Leoncio Sánchez, 22-year old RHP Eduardo Ayala, and 16-year old RHP Adrián García in return. |
| Monday, July 20th , 1903 |
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| Traded 38-year old 3B Eduardo Maestas to the Coamo Termales, getting 19-year old 2B Frank Casey in return. |
| Saturday, May 9th , 1903 |
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| Activated LF Matt Frederick from the injured list. |
| Wednesday, April 15th , 1903 |
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| Signed free agent 1B Clodovindo Armendáriz to a 1-year contract worth a total of P690. |
| Monday, March 30th , 1903 |
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| Placed LF Matt Frederick on the 10-day injured list, retroactive to 03/29/1903. |
| Monday, March 16th , 1903 |
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| Signed free agent LF Eugenio González to a 1-year contract worth a total of P1,460. |
| Tuesday, February 10th , 1903 |
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| Traded 20-year old 2B Mateo Rodríguez and 24-year old LHP Aldomiro González to the Caguas Coquis, getting 33-year old 1B Peyton Byrnes in return. |
| Tuesday, January 27th , 1903 |
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| Traded 40-year old 1B Shaun Mulholland and 21-year old RHP Francisco Pérez to the Sabana Grande Tejedores, getting 30-year old SS Cecilio Rivera in return. |
| Tuesday, January 20th , 1903 |
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| Signed free agent SP Luis Castro to a 1-year contract worth a total of P1,020. |
| Traded 30-year old LHP Polideuco Alcaraz and 21-year old 3B Catón Montoya to the Patillas Cuervos, getting 21-year old 2B Diego Romero in return. |
| Tuesday, January 13th , 1903 |
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| Signed free agent RP Aldomiro González to a 1-year contract worth a total of P940. |
| Tuesday, January 6th , 1903 |
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| Signed free agent RP Osmundo Maya to a 1-year contract worth a total of P860. |
