| Sunday, September 24th, 1978 | Activated 2B Dan Hughes from the disabled list. | Thursday, September 14th, 1978 | Placed 2B Dan Hughes on the 9-day disabled list. | Placed SP Sean Díaz on the 60-day disabled list. | Purchased the contract of SP Luke Baker from Triple A Brampton. | Saturday, September 9th, 1978 | Activated CF Ralph Thomas from the 60-day disabled list. | Monday, August 14th, 1978 | Failed to sign 9th round draft pick Wilbur Lindsay. | Sunday, August 13th, 1978 | Signed Wilson Rodríguez to a minor league contract with a signing bonus of $13,100. | Thursday, August 10th, 1978 | Signed Danny Owens to a minor league contract with a signing bonus of $23,700. | Tuesday, July 11th, 1978 | Signed Jack Joyner to a minor league contract with a signing bonus of $178,400. | Wednesday, June 28th, 1978 | Placed CF Ralph Thomas on the 60-day disabled list. | Tuesday, June 20th, 1978 | Signed Len Conner to a minor league contract with a signing bonus of $119,000. | Wednesday, April 26th, 1978 | Activated 3B Jeff Sexton from the disabled list. | SS David Jiménez was designated for assignment and placed on waivers (from active). | Friday, March 24th, 1978 | Placed CF Ralph Thomas on the 9-day disabled list. | Tuesday, March 21st, 1978 | Placed 3B Jeff Sexton on the 9-day disabled list. | Wednesday, November 30th, 1977 | Signed free agent CF Ralph Thomas to a 1-year contract worth a total of $50,200. | Demoted RF José García to Triple A Brampton. | Monday, October 31st, 1977 | Signed manager John O'Quinn to a 4-year, $84,500 per year contract. | Sunday, October 16th, 1977 | Signed pitching coach Bruno Muller to a 4-year, $32,800 per year contract. | |
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