The following transactions were recorded by the Arizona Diamondbacks for the calendar year 2003.
| December | |
| Date | Description |
| 12/23/2003 | Signed RHP''s Shane Reynolds and Steve Sparks to one-year contracts. |
| 12/05/2003 | Re-signed IF Carlos Baerga to a one-year contract. Signed OF Felix Jose to a minor league contract and invited him to Spring Training. |
| 12/01/2003 | Acquired 1B Richie Sexson, LHP Shane Nance and a player to be named from the Brewers for IFs Craig Counsell, Junior Spivey and Lyle Overbay, C Chad Moeller and LHPs Chris Capuano and Jorge de la Rosa. |
| November | |
| Date | Description |
| 11/28/2003 | Acquired LHP Casey Fossum, RHP Brandon Lyon, minor league LHP Jorge de La Rosa and a player to be named later from Boston in exchange for RHP Curt Schilling. |
| 11/20/2003 | Purchased the contract of RHP Brian Bruney from Triple-A Tucson; purchased the contract of RHP Casey Daigle from Double-A El Paso; purchased the contract of RHP Brandon Medders from Double-A El Paso; purchased the contract of RHP Phil Stockman from Double-A El Paso; purchased the contract of LHP Mike Gosling from Triple-A Tucson; purchased the contract of shortstop Jerry Gil from Single-A South Bend; purchased the contract of second baseman Scott Hairston from Triple-A Tucson; purchased the contract of third baseman Chad Tracy from Triple-A Tucson; purchased the contract of outfielder Josh Kroeger from Double-A El Paso; activated RHP Mike Koplove from the 60-day disabled list; signed OF Luis Carlos Garcia to a minor league contract and invited him to Spring Training. Sent RHP Jeremy Ward, RHP Beltran Perez and OF Doug DeVore outright to Triple-A Tucson. |
| 11/19/2003 | Signed INF-OF Donnie Sadler to a minor league contract and invited him to Spring Training. |
| 11/12/2003 | Signed C/1B Alan Zinter to a minor league contract and invited him to Spring Training. |
| October | |
| Date | Description |
| 10/20/2003 | Re-signed RHP Brady Raggio to a minor league contract. |
| 10/02/2003 | Declined RHP Miguel Batista''s option for 2004, making him a free agent. |
| September | |
| Date | Description |
| 09/01/2003 | Activated 1B Mark Grace from the 15-day disabled list; transferred RHP Mike Koplove to the 60-day disabled list; recalled Ps Chris Capuano, Edgar Gonzalez and John Patterson from Triple-A Tucson; purchased the contract of LHP Dennys Reyes from Tucson; recalled LHP Eddie Oropesa from Double-A El Paso. |
| August | |
| Date | Description |
| 08/31/2003 | Purchased the contract of OF Felix Jose from Triple-A Tucson; optioned LHP Eddie Oropesa to Double-A El Paso. |
| 08/06/2003 | Placed IF Mark Grace on the 15-day DL with a hyper-extended right elbow; Called up IF Robby Hammock from Triple-A Tucson. |
| July | |
| Date | Description |
| 07/29/2003 | Acquired OF Raul Mondesi from the Yankees in exchange for OF David Dellucci, P Bret Prinz and C Jon Mark Sprowl. |
| 07/23/2003 | Activated C Rod Barajas and OF Danny Bautista from the disabled list; Optioned C Robby Hammock and IF Lyle Overbay to Triple-A Tucson. |
| 07/21/2003 | Activated 2B Junior Spivey from the 15-day DL; optioned OF Luis Terrero to Triple-A Tucson. |
| 07/20/2003 | Activated LHP Randy Johnson from the 60-day DL; Outrighted RHP Brady Raggio to Triple-A Tucson |
| 07/18/2003 | Traded IF Tony Womack to the Rockies for minor league pitcher Mike Watson. |
| 07/12/2003 | Activated RHP Curt Schilling from the 15-day DL; optioned RHP Andrew Good to Triple-A Tucson |
| 07/10/2003 | Optioned P Chris Capuano to Triple-A Tucson. Recalled OF Luis Terrero from Tucson. |
| 07/08/2003 | Optioned P John Patterson to Triple-A Tucson. Recalled P Chris Capuano from Triple-A Tucson. |
| 07/07/2003 | Activated IF Craig Counsell from the 60-day DL. Placed C Rod Barajas on the 15-day DL. |
| June | |
| Date | Description |
| 06/30/2003 | Activated RHP Matt Mantei from the 15-day DL. Designated RHP Ricky Bottalico for assignment. |
| 06/28/2003 | Placed IF Tony Womack on the 15-day DL (sprained left knee). Activated Shea Hillenbrand from the 15-day DL. |
| 06/23/2003 | Placed RHP Mike Koplove on the 15-day DL (retroactive to June 19). Purchased the contract of Ricky Bottalico from Triple-A Tucson. Transferred LHP Randy Johnson from the 15-day DL to the 60-day DL |
| 06/21/2003 | Placed OF Danny Bautista on the 15-day DL (retroactive to June 19). Purchased the contract of RHP Brady Raggio from Triple-A Tucson. |
| 06/18/2003 | Placed IF Shea Hillenbrand on the 15-day DL. Activated OF David Dellucci from the 15-day DL. |
| 06/14/2003 | Placed IF Junior Spivey on the 15-day DL (sprained left ankle). Recalled IF Matt Kata from Triple-A Tucson. |
| 06/13/2003 | Activated RHP Mike Koplove off 15-day DL. Designated RHP Scott Service for assignment. |
| 06/12/2003 | Signed LHP Dennys Reyes to a minor league contract and assigned him to Triple-A Tucson. |
| 06/08/2003 | Activated RHP Brandon Webb from the 15-day DL. Optioned RHP Edgar Gonzalez to Triple-A Tucson. |
| 06/06/2003 | Placed OF David Dellucci on the 15-day DL (concussion). Recalled INF-OF Robby Hammock from Triple-A Tucson. |
| 06/03/2003 | Placed RHP Curt Schilling on the 15-day DL with a fracture in his right hand. Called up RHP Andrew Good. |
| 06/01/2003 | Designated Matt Williams for assignment to make room for Shea Hillenbrand. Called up RHP Edgar Gonzalez from Triple-A Tucson. Called up RHP Jose Valverde from Triple-A Tucson. Placed RHP Mike Koplove on the 15-day DL (retroactive to May 27) with tendonitis in the right shoulder. Placed RHP Matt Mantei on the 15-day DL (retroactive to May 27) with tendonitis in the right shoulder. |
| May | |
| Date | Description |
| 05/30/2003 | Activated LHP Stephen Randolph from the 15-day DL. |
| 05/29/2003 | Traded RHP Byung-Hyun Kim to the Boston Red Sox for 3B Shea Hillenbrand. |
| 05/28/2003 | Placed RHP Brandon Webb on the 15-day DL (retroactive to May 24) with tendinitis in his right elbow. Recalled RHP John Patterson from Triple-A Tucson. |
| 05/26/2003 | Activated RHP Byung-Hyun Kim from the 15-day DL. Optioned RHP Andrew Good to Triple-A Tucson. |
| 05/18/2003 | Optioned LHP Chris Capuano to Triple-A Tucson and purchased the contract of LHP Eddie Oropesa from Tucson. Moved INF Craig Counsell from the 15-day DL to the 60-day DL. |
| 05/07/2003 | Placed INF Craig Counsell on the 15-day DL with a dislocated right thumb. Recalled INF Alex Cintron from Triple-A Tucson. |
| 05/04/2003 | Placed LHP Stephen Randolph on the 15-day DL with a strained oblique muscle. Called up LHP Chris Capuano from Triple-A Tucson. |
| 05/03/2003 | Activated RHP Curt Schilling off 15-day DL. Optioned C Robby Hammock to Triple-A Tucson. Placed RHP Byung-Hyun Kim on 15-day DL (retroactive to April 30). Called up RHP Scott Service from Triple-A Tucson. |
| 05/02/2003 | Placed LHP Randy Johnson on the 15-day DL following knee surgery. Recalled RHP Brandon Webb from Triple-A Tucson. |
| April | |
| Date | Description |
| 04/28/2003 | Placed RHP Curt Schilling on the 15-day DL with appendicitis. Activated C Rod Barajas from the 15-day DL. |
| 04/27/2003 | Activated LHP Randy Johnson from the 15-day DL. Optioned RHP Brandon Webb to Triple-A Tucson. |
| 04/21/2003 | Placed LHP Randy Johnson on the 15-day DL with a sprained right knee (retroactive to April 12). Recalled RHP Brandon Webb from Triple-A Tucson. |
| 04/16/2003 | Optioned RHP John Patterson to Triple-A Tucson. Recalled RHP Andrew Good from Triple-A Tucson. |
| 04/11/2003 | Sent RHP Scott Service outright to Triple-A Tucson. Recalled RHP John Patterson from Triple-A Tucson. |
| 04/06/2003 | Placed C Rod Barajas on the 15-day DL with a strained hamstring. |
| 04/04/2003 | Moved RHP Bret Prinz from the 15-day DL to the 60-day DL. Purchased the contract of pitcher Scott Service from Triple-A Tucson. Sent C Robby Hammock to Tucson (PCL). Released LHP Greg Swindell. |
| 04/01/2003 | Placed P Bret Prinz on 15-day DL with a strained right groin and called up Robby Hammock from Triple-A Tucson. |
| March | |
| Date | Description |
| 03/24/2003 | Signed pitcher Randy Johnson to a two-year contract extension through the 2005 season. |
| 03/19/2003 | Signed outfielder Luis Gonzalez to a three-year contract extension through the 2006 season. |
| 03/17/2003 | Optioned pitchers Andrew Good and Brandon Webb; infielders Matt Kata and Tim Olson along with outfielder Doug DeVore to Triple-A Tucson. Sent pitchers Paul Abbott, Ricky Bottalico and Manny Aybar along with catcher Willie Morales and infielder Mike Bell to minor league camp. |
| 03/08/2003 | Sent pitchers Greg Aquino, Chris Capuano, Mike Gosling, Beltran Perez, Jose Valverde and Jeremy Ward to minor league camp. |
| February | |
| Date | Description |
| 02/24/2003 | Signed infielder Junior Spivey to a two-year contract through 2004. |
| January | |
| Date | Description |
| 01/31/2003 | Signed INF Carlos Baerga to a minor league contract and invited him to Spring Training. |
| 01/30/2003 | Signed P Ricky Bottalico to a minor league contract and invited him to Spring Training. |
| 01/29/2003 | Signed P''s Ron Villone and Mike Jackson to minor league contracts and invited them to Spring Training. |
| 01/24/2003 | Signed P Manny Aybar to a minor league contract and invited him to Spring Training. |
| 01/17/2003 | Agreed to terms with OF David Dellucci on a one-year contract. |
| 01/16/2003 | Agreed to terms with P Byung-Hyun Kim on a one-year deal. Agreed to terms with OF Quinton McCracken on a two-year deal. |
| 01/09/2003 | Agreed to terms with P Elmer Dessens on a two-year contract. |
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