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| Friday, August 24th , 1888 |
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| Signed Pitching Coach Ricardo Gonzalez to a 3-year, P136 per year contract. |
| Friday, August 17th , 1888 |
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| Fired Pitching Coach Arturo Rios. |
| Tuesday, August 14th , 1888 |
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| Signed SP Ronan Martinez to a 2-year contract extension worth a total of P700. |
| Monday, June 4th , 1888 |
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| Signed international amateur RF Edmundo Romero out of Dominican Republic to a minor league contract. |
| Monday, May 14th , 1888 |
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| Signed free agent SP Marquis Marshall to a minor league contract. |
| Thursday, April 19th , 1888 |
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| Signed free agent RP Gumersindo Montoya to a 1-year contract worth a total of P372. |
| Monday, April 16th , 1888 |
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| Signed free agent 1B Charlie Levis to a 2-year contract worth a total of P1,020. |
| Friday, March 9th , 1888 |
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| Signed free agent 1B Cyclone Ryan to a minor league contract with a major league option. |
| Tuesday, March 6th , 1888 |
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| Signed free agent LF Pat J Scanlon to a minor league contract with a major league option. |
| Friday, February 24th , 1888 |
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| Signed free agent SS Etelfrido Gonzalez to a 8-year contract worth a total of P5,100. |
| Monday, February 20th , 1888 |
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| Signed free agent CF Marvin Ware to a 8-year contract worth a total of P4,160. |
| Sunday, February 19th , 1888 |
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| Signed free agent 2B Bill Kuehne to a 5-year contract worth a total of P4,020. |
| Saturday, February 18th , 1888 |
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| Signed free agent C Lucio Flores to a 5-year contract worth a total of P2,590. |
| Thursday, February 16th , 1888 |
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| Signed free agent 1B Bermudo Nava to a 1-year contract worth a total of P280. |
