Twins' minor league left-hander Aaron Thompson will be suspended 50 games for violating baseball's drug policy.
Twins signed LHP Aaron Thompson to a minor league contract.
Pirates sent LHP Aaron Thompson outright to Triple-A Indianapolis.
Pirates recalled LHP Aaron Thompson from Triple-A Indianapolis.
Pirates optioned LHP Aaron Thompson to Triple-A Indianapolis.
Aaron Thompson pitched 4 1/3 scoreless innings against the Brewers in his major league debut Wednesday.
The Pirates have summoned left-hander Aaron Thompson from Triple-A Indianapolis.
Pirates sent LHP Aaron Thompson outright to Double-A Altoona.
Pirates designated LHP Aaron Thompson for assignment.
Pirates claimed LHP Aaron Thompson off waivers from the Nationals.
Nationals optioned RHPs Collin Balester and LHP Atahualpa Severino to Triple-A Syracuse; optioned RHPs Ryan Mattheus and LHP Aaron Thompson to Double-A Syracuse; optioned RHP Juan Jaime to Single-A Potomac.
Nationals purchased the contracts of LHP Aaron Thompson, RHP Juan Jaime, and LHP Atahualpa Severino.
Nationals acquired LHP Aaron Thompson from the Marlins for first baseman Nick Johnson.