Mariners Roster & Staff
Transactions
| Date | Transaction |
| 03/31/13 | Seattle Mariners selected the contract of RHP D.J. Mitchell from Tacoma Rainiers. |
| 03/31/13 | Seattle Mariners optioned RHP D.J. Mitchell to Tacoma Rainiers. |
| 03/31/13 | Seattle Mariners designated Casper Wells for assignment. |
| 03/30/13 | Seattle Mariners released C Ronny Paulino. |
| 03/27/13 | Seattle Mariners optioned RHP Erasmo Ramirez to Tacoma Rainiers. |
| 03/27/13 | LHP Jeremy Dobbs assigned to Seattle Mariners. |
| 03/27/13 | RHP Bobby Shore assigned to Seattle Mariners. |
| 03/26/13 | RHP Oliver Garcia assigned to Seattle Mariners. |
| 03/26/13 | RHP Cameron Copping assigned to Seattle Mariners. |
| 03/25/13 | Josh Kinney roster status changed by Seattle Mariners. |
| 03/25/13 | Seattle Mariners selected the contract of RHP Kameron Loe from Tacoma Rainiers. |
| 03/25/13 | Seattle Mariners signed free agent RHP Anjul Hernandez to a minor league contract. |
| 03/24/13 | Seattle Mariners signed free agent LF Endy Chavez to a minor league contract and invited him to spring training. |
| 03/24/13 | RHP Blake Hauser assigned to Seattle Mariners. |
| 03/23/13 | Seattle Mariners released 1B Mike Jacobs. |
| 03/23/13 | Seattle Mariners released RHP Jon Garland. |
| 03/22/13 | RHP Matt Vedo assigned to Seattle Mariners. |
| 03/22/13 | RHP David Colvin assigned to Seattle Mariners. |
| 03/21/13 | Seattle Mariners optioned Carlos Peguero to Tacoma Rainiers. |
| 03/19/13 | 3B Leury Bonilla assigned to Seattle Mariners. |
| 03/19/13 | Seattle Mariners optioned RF Eric Thames to Tacoma Rainiers. |
| 03/18/13 | Seattle Mariners signed free agent OF Bryan Leal to a minor league contract. |
| 03/17/13 | LHP James Gillheeney assigned to Seattle Mariners. |
| 03/17/13 | C Brandon Bantz assigned to Seattle Mariners. |
| 03/16/13 | IF Anthony Phillips assigned to Seattle Mariners. |
| 03/16/13 | C Christian Carmichael assigned to Seattle Mariners. |
| 03/16/13 | RHP Andrew Kittredge assigned to Seattle Mariners. |
| 03/16/13 | RHP Stephen Kohlscheen assigned to Seattle Mariners. |
| 03/15/13 | Seattle Mariners optioned OF Francisco Martinez to Jackson Generals. |
| 03/15/13 | RHP Forrest Snow assigned to Seattle Mariners. |
| 03/15/13 | RHP Steven Hensley assigned to Seattle Mariners. |
| 03/15/13 | RHP Tyler Burgoon assigned to Seattle Mariners. |
| 03/15/13 | Seattle Mariners optioned Bobby LaFromboise to Tacoma Rainiers. |
| 03/15/13 | LHP Nick Valenza assigned to Seattle Mariners. |
| 03/15/13 | Seattle Mariners optioned Vinnie Catricala to Tacoma Rainiers. |
| 03/15/13 | Seattle Mariners optioned Carlos Triunfel to Tacoma Rainiers. |
| 03/15/13 | Seattle Mariners optioned Alex Liddi to Tacoma Rainiers. |
| 03/15/13 | Seattle Mariners optioned LF Julio Morban to Jackson Generals. |
| 03/15/13 | Seattle Mariners optioned Yoervis Medina to Tacoma Rainiers. |
| 03/15/13 | LHP Kyle Hunter assigned to Seattle Mariners. |
| 03/15/13 | RF Jabari Blash assigned to Seattle Mariners. |
| 03/15/13 | C Luke Guarnaccia assigned to Seattle Mariners. |
| 03/15/13 | OF Jamal Austin assigned to Seattle Mariners. |
| 03/15/13 | SS Gabriel Noriega assigned to Seattle Mariners. |
| 03/15/13 | 3B Nate Tenbrink assigned to Seattle Mariners. |
| 03/15/13 | RHP Aaron Brooks assigned to Seattle Mariners. |
| 03/15/13 | RHP Grady Wood assigned to Seattle Mariners. |
| 03/15/13 | OF Denny Almonte assigned to Seattle Mariners. |
| 03/14/13 | Seattle Mariners optioned LHP Danny Hultzen to Tacoma Rainiers. |
| 03/14/13 | Seattle Mariners optioned Hector Noesi to Tacoma Rainiers. |
| 03/12/13 | Seattle Mariners optioned LHP Anthony Fernandez to Jackson Generals. |
| 03/11/13 | Seattle Mariners signed free agent IF Albert Herrera to a minor league contract. |
| 03/10/13 | Seattle Mariners optioned Chance Ruffin to Tacoma Rainiers. |
| 03/09/13 | RHP Matt Brazis assigned to Seattle Mariners. |
| 03/08/13 | Seattle Mariners signed free agent IF Alexdray Laya to a minor league contract. |
| 03/08/13 | LHP Roenis Elias assigned to Seattle Mariners. |
| 03/07/13 | CF Leon Landry assigned to Seattle Mariners. |
| 03/07/13 | SS Ketel Marte assigned to Seattle Mariners. |
| 03/07/13 | OF Jabari Henry assigned to Seattle Mariners. |
| 03/07/13 | 2B Tim Lopes assigned to Seattle Mariners. |
| 03/07/13 | C Marcus Littlewood assigned to Seattle Mariners. |
| 03/07/13 | SS Martin Peguero assigned to Seattle Mariners. |
| 03/07/13 | C Michael Dowd assigned to Seattle Mariners. |
| 03/07/13 | OF James Jones assigned to Seattle Mariners. |
| 03/07/13 | OF Guillermo Pimentel assigned to Seattle Mariners. |
| 03/07/13 | SS Chris Taylor assigned to Seattle Mariners. |
| 03/02/13 | RHP Dominic Leone assigned to Seattle Mariners. |
| 03/02/13 | RHP George Mieses assigned to Seattle Mariners. |