| Thursday, August 7th, 1958 | Released CF Jeff Cain. | Tuesday, July 8th, 1958 | Placed 3B Tomás Reyes on the 15-day disabled list. | Thursday, June 26th, 1958 | Activated 3B Pat Roberts from the disabled list. | Sunday, June 15th, 1958 | Promoted 2B Javier Tejo to Double A Beeville. | Received 1B Javier González from Double A Beeville. | Released 3B Luis Ortíz. | Promoted 1B Javier González to Double A Beeville. | Received 2B Javier Tejo from Double A Beeville. | Drafted SS António Díaz in the 1958 first-year player draft (Round 6, Pick 11, 97th overall pick). | Drafted 3B Cedric Stafford in the 1958 first-year player draft (Round 7, Pick 11, 114th overall pick). | Drafted SP Stan Field in the 1958 first-year player draft (Round 8, Pick 11, 130th overall pick). | Drafted RF José Venegas in the 1958 first-year player draft (Round 9, Pick 11, 146th overall pick). | Drafted SP Robert Garneau in the 1958 first-year player draft (Round 10, Pick 11, 162nd overall pick). | Promoted 2B Javier Tejo to Double A Beeville. | Received 1B Javier González from Double A Beeville. | Saturday, June 7th, 1958 | Activated LF Ánibal Jiménez from the disabled list. | Thursday, June 5th, 1958 | Activated SP Toshikasu Fujii from the disabled list. | Sunday, May 11th, 1958 | Released SS Jeff Cain. | Tuesday, April 29th, 1958 | Placed LF Ánibal Jiménez on the 15-day disabled list. | Thursday, March 27th, 1958 | Placed C Joe Harris on the 15-day disabled list. | |
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