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| Friday, October 30th , 2054 |
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| MSL Seattle Rocketeers: Signed Manager Mark Armstead. |
| Tuesday, October 27th , 2054 |
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| MSL Toledo Stingers: Signed Manager José Gato. |
| Saturday, October 24th , 2054 |
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| MSL Dayton Dirty Reds: RP Luis Cortéz retired from professional baseball. |
| MSL St. Louis Coeur: C Kaleva Lajunen retired from professional baseball. |
| MSL Toledo Stingers: RP Min Ji retired from professional baseball. |
| MSL Dayton Dirty Reds: CL Robun Fujihara retired from professional baseball. |
| MSL Hollywood Shredders: C Tade Clarijs retired from professional baseball. |
| MSL Long Island Lighthouse: Hitting Coach Takaaki Kobayashi retires. |
| MSL Mississippi Mockingbirds: Pitching Coach Mike Wilson retires. |
| MSL Hollywood Shredders: Hitting Coach Da-Quan Hawkins-Muckle leaves the team, his contract was not renewed |
| MSL Hollywood Shredders: Pitching Coach Ángel Ortíz leaves the team, his contract was not renewed |
| MSL Long Island Lighthouse: Pitching Coach Carlos Ramos leaves the team, his contract was not renewed |
| MSL Oakland Oaks: Pitching Coach Lucas Gameiro leaves the team, his contract was not renewed |
| MSL Toledo Stingers: Fired Manager Álex Burgos. |
| MSL Toledo Stingers: Signed Hitting Coach Kendrick Sullivan to a 1-year contract extension. |
| MSL St. Louis Coeur: Hitting Coach Tyrone Scott leaves the team, his contract was not renewed |
| MSL Dayton Dirty Reds: Signed Pitching Coach Jesús Salazar to a 2-year contract extension. |
| MSL Dayton Dirty Reds: Signed Hitting Coach José Sosa to a 2-year contract extension. |
| Saturday, September 5th , 2054 |
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| MSL Dayton Dirty Reds: Activated RF José López from the injured list. |
| MSL Toledo Stingers: Activated SP Riemer Keizer from the injured list. |
| MSL St. Louis Coeur: Activated RP Mannus Klapwijk from the injured list. |
| MSL St. Louis Coeur: Activated SP Kamuela Okilani from the injured list. |
| MSL Hollywood Shredders: Activated RP Ramón Lupercio from the injured list. |
