SPB In Season Free Agency -- Seasons Past Baseball
Regular season
| Transactions |
| Seq | Date | Team | Player | Type |
| 0 | 5/6/1988 | BRM | Booker,R | Released |
| 0 | 5/6/1988 | BRM | Kiefer | Signed |
| 0 | 5/6/1988 | EKL | Bando | Signed |
| 0 | 5/6/1988 | EKL | McGriff,T | Released |
| 0 | 5/13/1988 | BHS | Fields | Released |
| 0 | 5/13/1988 | BHS | McGriff,T | Signed |
| 0 | 5/20/1988 | BRM | Bando | Released |
| 0 | 5/20/1988 | BRM | Roenicke,G | Signed |
| 0 | 5/20/1988 | HAT | Buckner | Released |
| 0 | 5/20/1988 | HAT | Trout | Signed |
| 0 | 5/26/1988 | BRM | Kiefer | Released |
| 0 | 5/26/1988 | BRM | Roenicke,R | Signed |
| 0 | 5/26/1988 | IAC | Romine | Released |
| 0 | 5/26/1988 | IAC | Tabler | Signed |
| 0 | 5/26/1988 | MIL | Romine | Signed |
| 0 | 5/26/1988 | MIL | Tabler | Released |
| 0 | 6/2/1988 | HAT | Trout | Released |
| 0 | 6/2/1988 | IAC | Stoddard | Signed |
| 0 | 6/8/1988 | BRM | Pena,H | Released |
| 0 | 6/8/1988 | BRM | Smith,M | Signed |
| 0 | 6/8/1988 | FLU | Prince | Signed |
| 0 | 6/8/1988 | FLU | Sanchez | Released |
| 0 | 6/15/1988 | FLU | Anderson,R | Signed |
| 0 | 6/15/1988 | FLU | Nichols,C | Released |
| 0 | 6/15/1988 | HAT | Davis,John | Signed |
| 0 | 6/15/1988 | HAT | McMurtry | Released |
| 0 | 6/15/1988 | OTT | Blankenship,L | Released |
| 0 | 6/15/1988 | OTT | Buckner | Signed |