| Last updated: Sat, May 25, 2013, 20:24 EDT |
| Date | Player | Pos. | Transaction |
| 5/21 | Luke Putkonen | P | Called Up from Minors |
| 5/20 | Evan Reed | P | Sent to Minors |
| 5/16 | Evan Reed | P | Called Up from Minors |
| 5/15 | Al Alburquerque | P | Sent to Minors |
| 5/13 | Austin Jackson | CF | Placed on 15-Day DL, (Strained right hamstring) |
| 5/13 | Avisail Garcia | RF | Called Up from Minors |
| 5/11 | Phil Coke | P | Recalled From Minors, Rehab Assignment |
| 5/11 | Phil Coke | P | Removed From 15-Day DL, (Left groin strain) |
| 5/10 | Luke Putkonen | P | Sent to Minors |
| 5/6 | Phil Coke | P | Sent to Minors, For Rehabilitation |
| 5/2 | Luke Putkonen | P | Called Up from Minors |
| 5/1 | Jose Ortega | P | Called Up from Minors |
| 5/1 | Bruce Rondon | P | Sent to Minors |
| 5/1 | Phil Coke | P | Placed on 15-Day DL, (Left groin strain) |
| 4/30 | Avisail Garcia | RF | Sent to Minors |
| 4/30 | Avisail Garcia | RF | Recalled From Minors, Rehab Assignment |
| 4/30 | Avisail Garcia | RF | Removed From 15-Day DL, (Bruised right heel) |
| 4/25 | Avisail Garcia | RF | Sent to Minors, For Rehabilitation |
| 4/24 | Duane Below | P | Designated for Assignment |
| 4/24 | Jose Valverde | P | Purchased From Minors |
| 4/23 | Bruce Rondon | P | Called Up from Minors |
| 4/23 | Octavio Dotel | P | Placed on 15-Day DL, (Right elbow inflammation) |
| 4/4 | Jose Valverde | P | Signed to a Minor League Contract |
| 4/3 | Evan Reed | P | Acquired Off Waivers From, Miami |
| 4/3 | Evan Reed | P | Sent to Minors |
| 3/31 | Don Kelly | LF | Purchased From Minors |
| 3/31 | Matt Tuiasosopo | LF | Purchased From Minors |
| 3/29 | Justin Verlander | P | Signed, ( 2015-2019; Opt 2020)(five-year extension) |
| 3/28 | Danny Worth | 2B | Sent to Minors |
| 3/28 | Luis Marte | P | Sent to Minors |
| 3/27 | Quintin Berry | LF | Sent to Minors |
| 3/26 | Luke Putkonen | P | Sent to Minors |
| 3/26 | Avisail Garcia | RF | Placed on 15-Day DL, (Bruised right heel) |
| 3/19 | Duane Below | P | Sent to Minors |
| 3/19 | Bryan Holaday | C | Sent to Minors |
| 3/19 | Hernan Perez | 2B | Sent to Minors |
| 3/19 | Jose Ortega | P | Sent to Minors |
| 3/15 | Casey Crosby | P | Sent to Minors |
| 3/15 | Brennan Boesch | RF | Cleared Waivers and Became a Free Agent |
| 3/13 | Brennan Boesch | RF | Released |
| 2/4 | Max Scherzer | P | Signed, ( 2013)(avoids arbitration) |
| 1/20 | Pat Misch | P | Signed to a Minor League Contract |
| 1/18 | Rick Porcello | P | Signed, ( 2013)(avoids arbitration) |
| 1/18 | Austin Jackson | CF | Signed, ( 2013)(avoids arbitration) |
| 1/18 | Phil Coke | P | Signed, ( 2013)(avoids arbitration) |
| 1/18 | Brennan Boesch | RF | Signed, ( 2013)(avoids arbitration) |
| 1/18 | Alex Avila | C | Signed, ( 2013)(avoids arbitration) |
| 1/18 | Doug Fister | P | Signed, ( 2013)(avoids arbitration) |
| 1/16 | Don Kelly | LF | Signed to a Minor League Contract |
| 12/19 | Adam Wilk | P | Signed to Play in Korea |
| 12/19 | Adam Wilk | P | Released |
| 12/19 | Anibal Sanchez | P | Signed as Free Agent, ( 2013-2017; Opt 2018)(five-year contract) |
| 12/10 | Brayan Pena | C | Signed as Free Agent, (one-year contract) |
| 11/30 | Daniel Schlereth | P | Not Offered Contract and Became Free Agent, (non-tendered) |
| More Transactions |
