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| Friday, August 24th , 1888 |
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| SP Thomas Mortensen retired from professional baseball. |
| Monday, July 30th , 1888 |
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| Signed 3B Dennis Bygrove to a 5-year contract extension worth a total of P4,200. |
| Sunday, July 22nd , 1888 |
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| Signed LF Bob Riordan to a 3-year contract extension worth a total of P2,220. |
| Monday, June 18th , 1888 |
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| Traded 28-year old SS Gene Daoust and 18-year old RHP Joe Sharpe to the Hamilton Hammers, getting 26-year old LF Bob Riordan in return. |
| Monday, April 23rd , 1888 |
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| Signed international amateur 3B Ross Handy out of St. Vincent & The Grenadines to a minor league contract. |
| Tuesday, April 10th , 1888 |
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| Signed free agent SP Jack McLean to a 1-year contract worth a total of P276. |
| Monday, March 26th , 1888 |
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| Signed 1B Coach Augurio Mendoza to a 3-year, P104 per year contract. |
| Monday, February 20th , 1888 |
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| Signed Hitting Coach Arnaldo Gonzales to a 3-year, P210 per year contract. |
| Friday, February 17th , 1888 |
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| Signed 3B Coach Daniel Harvey to a 3-year, P56 per year contract. |
| Monday, February 13th , 1888 |
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| Signed Pitching Coach Casimiro Rivera to a 3-year, P120 per year contract. |
| Friday, February 10th , 1888 |
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| Signed free agent RP Shota Guramov to a 1-year contract worth a total of P378. |
| Tuesday, February 7th , 1888 |
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| Signed free agent 1B Silvio Lopez to a minor league contract with a major league option. |
| Monday, February 6th , 1888 |
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| Signed free agent RP Mariano Mazon to a 1-year contract worth a total of P408. |
| Sunday, January 29th , 1888 |
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| SP Heraclio Cabrera becomes a free-agent. |
| SP Andrónico Morales becomes a free-agent. |
| SP Peter Owens becomes a free-agent. |
| RP Damián Acosta becomes a free-agent. |
| RP Hormisdas Cavazos becomes a free-agent. |
| RP Leví Cerda becomes a free-agent. |
| RP Sean Hooper becomes a free-agent. |
| C Fernando Cervantes becomes a free-agent. |
| C Lázaro Santiago becomes a free-agent. |
| C Constancio Vinalay becomes a free-agent. |
| 1B Hugo Campos becomes a free-agent. |
| 1B Miqueas Ruiz becomes a free-agent. |
| 2B Ladislao de Leon becomes a free-agent. |
| 2B Faro Moreno becomes a free-agent. |
| 3B Justin Robinson becomes a free-agent. |
| 3B Zion Thompson becomes a free-agent. |
| SS Álvaro Concepcion becomes a free-agent. |
| SS Raimundo Thomas becomes a free-agent. |
| LF Cástico Diaz becomes a free-agent. |
| LF Walt Hoyt becomes a free-agent. |
| LF Panagiotes White becomes a free-agent. |
| CF Yahashi Maehara becomes a free-agent. |
| CF Jaden Willis becomes a free-agent. |
| RF Florián Chavarria becomes a free-agent. |
| RF Marcos Duran becomes a free-agent. |
| RF Juan Vargas becomes a free-agent. |
| SP Howell White joins the team. |
| SP Jim Norlander joins the team. |
| SP Dave Holland joins the team. |
| C Cooper Trites joins the team. |
| SS Vaughan Allan joins the team. |
| RF Miles Jackson joins the team. |
| 1B Joe Cobb joins the team. |
| 2B Russ Schanowski joins the team. |
| SS Gene Daoust joins the team. |
| 3B Dennis Bygrove joins the team. |
| CF Marlin Hartling joins the team. |
| RF Jeff Beaumond joins the team. |
| RF Dave Starr joins the team. |
| LF Ed Brooks joins the team. |
| RF Jeff Christensen joins the team. |
| 1B Daniel Granberry joins the team. |
