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| Monday, December 24th, 1990 |
|---|
| Promoted SP Leegan Scholar to Major League Washington. |
| Thursday, December 20th, 1990 |
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| Received RP Leegan Scholar from Major League Washington. |
| Monday, December 3rd, 1990 |
|---|
| Promoted SP Francisco Morote to Major League Washington. |
| Sunday, December 2nd, 1990 |
|---|
| SP Yoshimochi Shimizu becomes a free-agent. |
| SP César Otero becomes a free-agent. |
| C Brandon Pruitt becomes a free-agent. |
| 2B Charles Ball becomes a free-agent. |
| 2B Roland Wells becomes a free-agent. |
| Thursday, November 15th, 1990 |
|---|
| Signed hitting coach Gustavo Trujillo. |
| Friday, November 9th, 1990 |
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| Received RP Francisco Morote from Major League Washington. |
| Received RP Pedro Valentín from Major League Washington. |
| Demoted SP Yoshimatsu Kumatani to Double A Reading. |
| Demoted SP Jason Owens to Double A Reading. |
| Demoted RP César Martínez to Double A Reading. |
| Demoted 2B Pat Willis to Double A Reading. |
| Demoted CL Jorge Avila to Class A Hampton Beach. |
| Demoted RP Itri Olu to Class A Hampton Beach. |
| Demoted RP Hideyori Narita to Short Season A Queens. |
| Promoted SP Pedro Valentín to Major League Washington. |
| Received CL Juan Luis Torres from Double A Reading. |
| Signed Manager Terence Rivers to a 3-year contract extension. |
| Hitting Coach Manny Rodríguez leaves the team, his contract was not renewed. |
| Received SP Jorge Avila from Class A Hampton Beach. |
| Demoted CL Juan Luis Torres to Class A Hampton Beach. |
| Monday, October 15th, 1990 |
|---|
| Received RP Hideyori Narita from Double A Reading. |
| Saturday, October 13th, 1990 |
|---|
| Demoted RP Juan Luis Torres to Short Season A Queens. |
| Friday, October 5th, 1990 |
|---|
| Received RP Juan Luis Torres from Double A Reading. |
| Demoted RP José Ortíz to Double A Reading. |
| Sunday, September 30th, 1990 |
|---|
| Signed hitting coach Manny Rodríguez. |
| Wednesday, September 26th, 1990 |
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| Received SP Jason Owens from Double A Reading. |
| Saturday, September 22nd, 1990 |
|---|
| SS Derek McAnally retired from professional baseball. |
| CF Román Robles retired from professional baseball. |
| C Edgar Herrera retired from professional baseball. |
| Activated 3B Catalin Botoman from the injured list. |
| Activated 2B Pat Willis from the injured list. |
| Received SP César Otero from Double A Reading. |
| HC Kevin Burt retires. |
