| Saturday, December 1st, 2018 |
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| Traded 25-year-old minor league starting pitcher Bartolo Romo, 24-year-old minor league starting pitcher Mario Chávez, 31-year-old shortstop Rafael Salas and 20-year-old minor league center fielder Don Keating to the Baffin Island Beavers, getting 29-year-old starting pitcher Olivier Beaudoin, 22-year-old minor league first baseman Derek Ramsey and $650,000 in cash in return. | | Placed SP Olivier Beaudoin on the active roster. | | SP Artie Hoffman was designated for assignment and placed on waivers. | | SP Mike Drader was designated for assignment and placed on waivers. | | Traded 30-year-old catcher Manuel González, 29-year-old reliever Ángel López, 23-year-old minor league starting pitcher Arturo Martínez, 19-year-old minor league center fielder Roberto Cardona and 27-year-old second baseman Damon Mitchell to the Toronto Titans, getting 31-year-old starting pitcher Guillermo Mendoza in return. | | Lost RF Nick Davis in the Rule 5 Draft to the St. Louis Browns. | | Lost C David Raymos in the Rule 5 Draft to the St. Louis Browns. | | Lost SP Carlos Hernández in the Rule 5 Draft to the Madison Bombers. | | Lost MR Biagio Muscetta in the Rule 5 Draft to the St. Louis Browns. | | Lost LF Pedro Fuentes in the Rule 5 Draft to the St Charles Sheens. | | Lost MR Ramiro Fernández in the Rule 5 Draft to the Vista Panthers. |
| Tuesday, November 20th, 2018 |
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| LF Mark Vestal received a 1-year contract through automatic renewal worth a total of $400,000. | | LF A.J. Major received a 1-year contract through automatic renewal worth a total of $400,000. | | CF Seung-woo Yi received a 1-year contract through automatic renewal worth a total of $400,000. | | 1B Javier Villegas received a 1-year contract through automatic renewal worth a total of $400,000. | | 3B Morgan Gibbon received a 1-year contract through automatic renewal worth a total of $400,000. |
| Saturday, November 17th, 2018 |
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| LF Roger Robinson was not offered arbitration, becomes a free agent. | | MR Pepe Hernández received a 1-year contract through arbitration worth a total of $2,940,000. | | MR Ignacio Ríos received a 1-year contract through arbitration worth a total of $725,000. | | LF Carlos Ríos was not offered arbitration, becomes a free agent. | | RF Cristóbal Cintrón received a 1-year contract through arbitration worth a total of $5,175,000. | | C Manuel González received a 1-year contract through arbitration worth a total of $9,168,750. | | C Teddy Bates received a 1-year contract through arbitration worth a total of $650,000. | | MR Noël Manucci received a 1-year contract through arbitration worth a total of $1,700,000. | | SP Fernand Picard received a 1-year contract through arbitration worth a total of $650,000. | | 2B Damon Mitchell received a 1-year contract through arbitration worth a total of $6,855,000. | | 2B Bill Bertrand received a 1-year contract through arbitration worth a total of $2,250,000. |
| Monday, November 5th, 2018 |
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| Executed the last optional contract year of MR Jorge Vásquez. | | Placed MR Noël Manucci on the active roster. | | Activated MR Noël Manucci from the 60-day disabled list. |
| Saturday, October 27th, 2018 |
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| GM Wil Rivera retires. |
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