| Saturday, December 8th, 2018 |
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| Signed free agent RF Kentaro Aoki to a 1-year contract worth a total of $800,000. | | Signed free agent MR Guillermo Martínez to a 3-year contract worth a total of $14,000,000. | | Signed free agent LF Carlos Ríos to a 3-year contract worth a total of $21,000,000. | | RF Ricardo Silva was designated for assignment and placed on waivers. | | SP Cody O'Reilly was designated for assignment and placed on waivers. | | Placed RF Kentaro Aoki on the active roster. | | Placed MR Guillermo Martínez on the active roster. | | Placed LF Carlos Ríos on the active roster. |
| Tuesday, November 20th, 2018 |
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| SS Wilson Gómez received a 1-year contract through automatic renewal worth a total of $400,000. | | MR Bob Newton becomes a free-agent. | | LF Kentaro Aoki becomes a free-agent. | | MR Paco Ríos received a 1-year contract through automatic renewal worth a total of $400,000. | | SP Martín Ramírez received a 1-year contract through automatic renewal worth a total of $400,000. | | LF Bill Wilson received a 1-year contract through automatic renewal worth a total of $400,000. | | 1B Edgardo Gonzáles received a 1-year contract through automatic renewal worth a total of $400,000. | | RF Alonzo Medine received a 1-year contract through automatic renewal worth a total of $400,000. | | SP Dave Huot received a 1-year contract through automatic renewal worth a total of $400,000. | | SP Cody O'Reilly received a 1-year contract through automatic renewal worth a total of $400,000. | | C Jesús Dávila received a 1-year contract through automatic renewal worth a total of $400,000. | | RF Ricardo Silva received a 1-year contract through automatic renewal worth a total of $400,000. | | LF Pedro Zaragoza received a 1-year contract through automatic renewal worth a total of $400,000. | | LF Larry Jackson becomes a free-agent. |
| Saturday, November 17th, 2018 |
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| 2B Tony Ramírez received a 1-year contract through arbitration worth a total of $750,000. | | C Fernando Ramos received a 1-year contract through arbitration worth a total of $5,000,000. | | SP Brett Dwyer received a 1-year contract through arbitration worth a total of $3,292,500. | | MR Mark Sturdy received a 1-year contract through arbitration worth a total of $750,000. | | LF Aroghetto Dionisotti received a 1-year contract through arbitration worth a total of $2,000,000. | | MR António Alvarado received a 1-year contract through arbitration worth a total of $650,000. |
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