Transactions| Date | Transaction | |||
| 7/30/03 | Transferred LHP Denny Neagle to the 60-day disabled list following season-ending elbow surgery. | |||
| 7/29/03 | Traded P Chris Michalak to Cincinnati for a player to be named later. | |||
| 7/27/03 | Announced that OF-1B Mark Sweeney had accepted an assignment to Triple-A Colorado Springs. | |||
| 7/25/03 | Purchased the contract of RHP Chin-hui Tsao from Double-A Tulsa. Designated OF-1B Mark Sweeney for assignment. | |||
| 7/22/03 | Placed LHP Denny Neagle on the 15-day disabled list (retro to July 21) with inflammation in his left elbow. Recalled OF Rene Reyes from Triple-A Colorado Springs. | |||
| 7/19/03 | Designated RHP Joe Roa for assignment. | |||
| 7/18/03 | Acquired SS Tony Womack from Arizona for minor league pitcher Mike Watson | |||
| 7/13/03 | Placed RHP Nelson Cruz on the disabled list, retroactive to July 10with shoulder stiffness. | |||
| Acquired RHP Adam Bernero from the Detroit Tigers for OF/C Ben Petrick. | ||||
| 7/12/03 | Recalled OF Luke Allen from Triple-A Colorado Springs. | |||
| Designated OF Greg Vaughn for assignment. | ||||
| 7/4/03 | Signed RHP Joe Roa to a Major League contract. Recalled RHP Aaron Cook from Triple-A Colorado Springs. Optioned RHP Jason Young to Colorado Springs. Designated RHP Matt Miller for assignment. | |||
| 7/2/03 | Recalled RHP Jason Young from Triple-A Colorado Springs. Optioned OF-C Ben Petrick to Colorado Springs. | |||
| 7/1/03 | Activated RHP Denny Stark from the 60-day disabled list. Placed RHP Shawn Chacon on the 15-day DL with right elbow tendinitis. | |||