| | | Monday, March 30th, 1998 | | Drafted 2B Q. Barbot in the 1998 first-year player draft (Supplemental Round 1, Pick 7, 23rd overall Pick). | | Drafted SP M. Vázquez in the 1998 first-year player draft (Supplemental Round 1, Pick 22, 38th overall Pick). | | Drafted CL F. Salazar in the 1998 first-year player draft (Round 2, Pick 4, 46th overall Pick). | | Drafted 1B Á. Rodríguez in the 1998 first-year player draft (Round 3, Pick 10, 68th overall Pick). | | Drafted C M. López in the 1998 first-year player draft (Round 4, Pick 10, 84th overall Pick). | | Drafted SP C. Aguilar in the 1998 first-year player draft (Round 5, Pick 10, 100th overall Pick). |
| Sunday, March 8th, 1998 | | Signed free agent SP J. Rojas to a minor league contract. | | Signed free agent C A. De La Cruz to a minor league contract. | | Signed free agent MR B. Davis to a minor league contract. | | Signed free agent SP A. Alexander to a minor league contract. | | Signed free agent MR N. Collingridge to a minor league contract. | | Signed free agent MR C. Caballero to a minor league contract. | | Signed free agent MR D. Scott to a minor league contract. | | Signed free agent SP J. Quintero to a minor league contract. |
| Thursday, December 18th, 1997 | | Signed free agent MR S. Matsuda to a 2-year contract worth a total of $7,000,000. |
| Saturday, December 13th, 1997 | | Signed free agent SP G. Wilson to a 6-year contract worth a total of $72,306,000. |
| Thursday, December 11th, 1997 | | Signed free agent LF P. Ramos to a 5-year contract worth a total of $47,135,000. |
| Sunday, December 7th, 1997 | | Signed free agent C J. MacKey to a minor league contract. |
| Saturday, November 22nd, 1997 | | 1B G. Rivera becomes a free-agent. | | MR J. Pérez becomes a free-agent. | | MR D. Bausi becomes a free-agent. | | LF V. Reed becomes a free-agent. | | MR M. MacIntyre received a 1-year contract through automatic renewal worth a total of $100,000. | | LF A. Baer received a 1-year contract through automatic renewal worth a total of $100,000. | | RF W. Tupper becomes a free-agent. | | C J. Júlio becomes a free-agent. | | SP H. Han becomes a free-agent. | | CL J. Bean becomes a free-agent. | | SS F. Aranda becomes a free-agent. | | 1B J. Sánchez becomes a free-agent. | | SS H. Colón becomes a free-agent. |
| Wednesday, November 19th, 1997 | | SP T. Buck received a 1-year contract through arbitration worth a total of $3,400,000. | | C J. Coombs received a 1-year contract through arbitration worth a total of $643,850. | | 2B O. Morán received a 1-year contract through arbitration worth a total of $2,302,800. | | CF E. Hexeberg received a 1-year contract through arbitration worth a total of $800,000. | | 3B T. Thompson received a 1-year contract through arbitration worth a total of $602,680. | | CF J. Correa received a 1-year contract through arbitration worth a total of $817,000. | | MR D. Davis received a 1-year contract through arbitration worth a total of $1,643,200. | | MR J. Pérez received a 1-year contract through arbitration worth a total of $2,057,950. |
| Wednesday, October 29th, 1997 | | SP D. Flowers has executed his last optional contract year. | | Voided the team option year of 1B G. Rivera. |
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