Mariners Roster & Staff
Transactions
| Date | Transaction |
| 07/31/10 | Seattle Mariners recalled Sean White from Tacoma Rainiers. |
| 07/31/10 | Seattle Mariners recalled Matt Tuiasosopo from Tacoma Rainiers. |
| 07/31/10 | Seattle Mariners optioned Justin Smoak to Tacoma Rainiers. |
| 07/31/10 | Seattle Mariners placed LF Milton Bradley on the 15-day disabled list retroactive to July 27, 2010. Right knee tendinitis. |
| 07/31/10 | Seattle Mariners signed RHP Ben Versnik. |
| 07/28/10 | Seattle Mariners signed free agent OF Rafael Fernandez to a minor league contract. |
| 07/28/10 | Seattle Mariners recalled Luke French from Tacoma Rainiers. |
| 07/28/10 | Seattle Mariners placed LHP Ryan Rowland-Smith on the 15-day disabled list. Lower back strain. |
| 07/21/10 | Stephen Landazuri assigned to AZL Mariners from Seattle Mariners. |
| 07/21/10 | Jabari Blash assigned to AZL Mariners from Seattle Mariners. |
| 07/20/10 | Stephen Kohlscheen assigned to Pulaski Mariners from Seattle Mariners. |
| 07/20/10 | Seattle Mariners signed OF Jabari Blash. |
| 07/20/10 | Seattle Mariners signed RHP Stephen Landazuri. |
| 07/19/10 | Seattle Mariners signed free agent OF Phillips Castillo to a minor league contract. |
| 07/19/10 | Seattle Mariners signed free agent LHP Erick Gomez to a minor league contract. |
| 07/19/10 | Seattle Mariners signed free agent 3B Yordi Calderon to a minor league contract. |
| 07/19/10 | Seattle Mariners signed free agent RHP Jose Torres to a minor league contract. |
| 07/19/10 | Seattle Mariners signed free agent RHP Rigoberto Garcia to a minor league contract. |
| 07/19/10 | Seattle Mariners signed free agent LHP Luis Pina to a minor league contract. |
| 07/19/10 | Seattle Mariners signed RHP Stephen Kohlscheen. |
| 07/15/10 | LHP Matthew Petiton assigned to AZL Mariners from Seattle Mariners. |
| 07/15/10 | RHP Chad Cordero elected free agency. |
| 07/15/10 | Seattle Mariners optioned Sean White to Tacoma Rainiers. |
| 07/15/10 | Seattle Mariners signed free agent RHP Jamey Wright. |
| 07/15/10 | Seattle Mariners selected the contract of Chris Seddon from Tacoma Rainiers. |
| 07/14/10 | LHP Michael Vitale assigned to Pulaski Mariners from Seattle Mariners. |
| 07/14/10 | Blake Beavan assigned to West Tenn Diamond Jaxx from Seattle Mariners. |
| 07/14/10 | Josh Lueke assigned to West Tenn Diamond Jaxx from Seattle Mariners. |
| 07/14/10 | Matt Lawson assigned to West Tenn Diamond Jaxx from Seattle Mariners. |
| 07/14/10 | Seattle Mariners signed LHP Matthew Petiton. |
| 07/13/10 | Seattle Mariners signed free agent LHP Michael Vitale to a minor league contract. |
| 07/10/10 | Justin Smoak roster status changed by Seattle Mariners. |
| 07/10/10 | Seattle Mariners optioned Luke French to Tacoma Rainiers. |
| 07/09/10 | Seattle Mariners traded LHP Cliff Lee and RHP Mark Lowe to Texas Rangers for RHP Blake Beavan, RHP Josh Lueke, 1B Justin Smoak and 2B Matt Lawson. |
| 07/09/10 | Seattle Mariners traded LHP Cliff Lee and RHP Mark Lowe to Texas Rangers for RHP Blake Beavan, RHP Josh Lueke, 1B Justin Smoak and 2B Matt Lawson. |
| 07/09/10 | Seattle Mariners traded LHP Cliff Lee and RHP Mark Lowe to Texas Rangers for RHP Blake Beavan, RHP Josh Lueke, 1B Justin Smoak and 2B Matt Lawson. |
| 07/09/10 | Seattle Mariners traded LHP Cliff Lee and RHP Mark Lowe to Texas Rangers for RHP Blake Beavan, RHP Josh Lueke, 1B Justin Smoak and 2B Matt Lawson. |
| 07/09/10 | Seattle Mariners traded LHP Cliff Lee and RHP Mark Lowe to Texas Rangers for RHP Blake Beavan, RHP Josh Lueke, 1B Justin Smoak and 2B Matt Lawson. |
| 07/09/10 | Seattle Mariners traded LHP Cliff Lee and RHP Mark Lowe to Texas Rangers for RHP Blake Beavan, RHP Josh Lueke, 1B Justin Smoak and 2B Matt Lawson. |
| 07/09/10 | Seattle Mariners recalled Luke French from Tacoma Rainiers. |
| 07/05/10 | Mickey Wiswall assigned to Everett AquaSox from Seattle Mariners. |
| 07/04/10 | Scott Ronnenbergh assigned to AZL Mariners from Seattle Mariners. |
| 07/04/10 | Kody Kurowski assigned to AZL Mariners from Seattle Mariners. |
| 07/04/10 | Seattle Mariners signed 3B Mickey Wiswall. |
| 07/03/10 | Seattle Mariners signed LHP Scott Ronnenbergh. |
| 07/03/10 | Seattle Mariners signed LHP Kody Kurowski. |
| 07/01/10 | RHP Mark Worrell assigned to Tacoma Rainiers from Seattle Mariners. |