| Friday, June 29th , 1888 | | Signed free agent SP Levi McNally to a 1-year contract worth a total of $388. | | Wednesday, June 6th , 1888 | | Activated RF Alonzo Loring from the injured list. | | Sunday, May 27th , 1888 | | Placed RF Alonzo Loring on the 10-day injured list, retroactive to 05/26/1888. | | Wednesday, May 23rd , 1888 | | Signed free agent SP Glenn Springer to a 1-year contract worth a total of $400. | | Saturday, April 28th , 1888 | | Signed free agent SP Mike Sandstrom to a 1-year contract worth a total of $376. | | Signed free agent SP Bob Newhouse to a minor league contract with a major league option. | | Monday, April 2nd , 1888 | | Signed free agent SP Warren Burroughs to a 1-year contract worth a total of $392. | | Tuesday, March 20th , 1888 | | Signed free agent C Brick Cornwall to a 1-year contract worth a total of $316. | | Signed Scouting Director Marty Coss to a 2-year, $33 per year contract. | | Sunday, March 18th , 1888 | | Signed free agent C Ken Denham to a 1-year contract worth a total of $272. | | Signed free agent SS John Eliason to a 1-year contract worth a total of $372. | | Signed free agent RP Jim Butler to a minor league contract with a major league option. | | Saturday, March 17th , 1888 | | Signed free agent SP Ken Penney to a 1-year contract worth a total of $330. | | Signed free agent 1B John Davis to a 1-year contract worth a total of $650. | | Signed free agent RP Jim Quick to a minor league contract with a major league option. | | Thursday, March 15th , 1888 | | Signed free agent SS Bobby Kearns to a minor league contract. | | Wednesday, March 14th , 1888 | | Signed free agent SS Jerry Avery to a minor league contract. | |