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| Saturday, October 10th , 1903 |
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| Signed free agent RP Ramón López to a minor league contract with a major league option. |
| Wednesday, September 23rd , 1903 |
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| Placed C Chandler King on the 10-day injured list, retroactive to 09/22/1903. |
| Thursday, July 23rd , 1903 |
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| Traded 38-year old LHP Mercuriano Mejía to the Lajas Marcianos, getting 35-year old 1B Melquíades Milla in return. |
| Tuesday, July 21st , 1903 |
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| Released SP Hércules Hernández. |
| Monday, July 20th , 1903 |
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| Traded 20-year old CF Lorenzo Santillán to the Catano Guardacostas, getting 39-year old 1B Tarasio Lovato and 24-year old CF Arquímedes Guevara in return. |
| Monday, June 15th , 1903 |
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| Released 1B José Solís. |
| Sunday, June 14th , 1903 |
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| Signed free agent 1B Fernando Carías to a minor league contract. |
| Tuesday, May 26th , 1903 |
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| Released RF Édgar Lemus. |
| Monday, May 25th , 1903 |
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| Signed free agent C Salvador Cruz to a minor league contract. |
| Monday, April 6th , 1903 |
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| Released RP Carmelo Ocampo. |
| Released RP José María Jacobo. |
| Tuesday, March 17th , 1903 |
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| Signed free agent CF Lorenzo Santillán to a minor league contract. |
| Monday, March 16th , 1903 |
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| Signed free agent LF Lance Matheson to a minor league contract. |
| Tuesday, January 27th , 1903 |
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| Signed free agent RP Generoso Juárez to a minor league contract with a major league option. |
| Signed free agent RP José María Jacobo to a 1-year contract worth a total of P860. |
| Released RP Generoso Juárez. |
| Released RP Cástor Hernández. |
| Tuesday, January 20th , 1903 |
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| Signed free agent RP Cid Maldonado to a 1-year contract worth a total of P1,800. |
| Sunday, January 4th , 1903 |
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| Signed 3B Coach Ernesto Favela to a 3-year, P174 per year contract. |
