| Wednesday, October 1st, 1958 | Activated C Héctor Muńóz from the disabled list. | Tuesday, September 30th, 1958 | Activated SP Justin Porter from the 60-day disabled list. | Wednesday, September 24th, 1958 | Activated SP Javier López from the 60-day disabled list. | Monday, September 22nd, 1958 | Placed MR Elia Tari on the 60-day disabled list. | Sunday, September 21st, 1958 | Placed 3B Tomás Villarreal on the 15-day disabled list. | Wednesday, August 13th, 1958 | Signed Kenny Howell to a minor league contract with a signing bonus of $5,600. | Tuesday, August 12th, 1958 | Signed Jeff Foreman to a minor league contract with a signing bonus of $33,800. | Thursday, August 7th, 1958 | Signed Román Medina to a minor league contract with a signing bonus of $22,200. | Signed Carl Smiley to a minor league contract with a signing bonus of $8,600. | Monday, August 4th, 1958 | SP Zivota Antic was designated for assignment and placed on irrevocable waivers. | Monday, July 28th, 1958 | Activated CF Will Brown from the 60-day disabled list. | LF Jimmy Schmitt was designated for assignment and placed on waivers (from active). | Wednesday, July 9th, 1958 | Placed SP Júlio Hernández on the 60-day disabled list. | Thursday, June 19th, 1958 | Activated CF Dan Williams from the 60-day disabled list. | RF Juan Guerrero was designated for assignment and placed on irrevocable waivers. | Tuesday, June 3rd, 1958 | Activated RF Juan Guerrero from the disabled list. | LF Fernando Guzmán was designated for assignment and placed on irrevocable waivers. | Saturday, May 3rd, 1958 | Purchased the contract of SP Justin Porter from Double A Brownsville. | SP Phil Lewis was designated for assignment and placed on irrevocable waivers. | Sunday, March 30th, 1958 | Placed CF Will Brown on the 60-day disabled list. | Thursday, March 27th, 1958 | Placed RF Gang Han on the 15-day disabled list. | Thursday, December 12th, 1957 | Activated C Héctor Muńóz from the 60-day disabled list. | C Carl Webb was designated for assignment and placed on waivers (from active). | Tuesday, October 22nd, 1957 | Signed pitching coach Fernando Rivera to a 4-year, $29,200 per year contract. | |
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