| Wednesday, August 20th, 1958 | Activated LF Juan Mejía from the disabled list. | Sunday, August 10th, 1958 | Released 3B Jim Evans. | Saturday, August 9th, 1958 | Released 3B Xu Sen. | Saturday, August 2nd, 1958 | Released 1B Ralph Carr. | Friday, July 25th, 1958 | Placed LF Juan Mejía on the 15-day disabled list. | Released RF Don Butt. | Sunday, June 15th, 1958 | Released 3B Xu Sen. | Released 3B Ken Smith. | Promoted 2B Byron Achber to Double A Laredo. | Received C Ricardo González from Double A Laredo. | Promoted C César Lozano to Double A Laredo. | Received 3B Weldon McClurg from Double A Laredo. | Received 3B Ken Smith from Triple A Guelph. | Received 3B Luis Ortíz from Triple A Guelph. | Drafted MR Carlos Espinoza in the 1958 first-year player draft (Round 6, Pick 7, 93rd overall pick). | Drafted LF Will Corbin in the 1958 first-year player draft (Round 7, Pick 7, 110th overall pick). | Drafted MR Nathan Rigney in the 1958 first-year player draft (Round 8, Pick 7, 126th overall pick). | Drafted MR José Morales in the 1958 first-year player draft (Round 9, Pick 7, 142nd overall pick). | Promoted 1B Danny Bullock to Double A Laredo. | Received C César Lozano from Double A Laredo. | Friday, May 23rd, 1958 | Placed SP Oliver Clark on the 15-day disabled list. | Wednesday, November 20th, 1957 | Activated MR Alex Welch from the disabled list. | |
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