Sadzeck signed a minor-league contract with the Pirates on Feb. 2.
The Twins released Sadzeck on July 5.
Sadzeck signed a minor-league contract with the Twins on Friday.
Sadzeck signed a minor-league deal with the Nationals on Thursday, Jesse Dougherty of The Washington Post reports.
Sadzeck elected free agency on Saturday rather than accept an outright assignment, Todd Rosiak of the Milwaukee Journal Sentinel reports.
Sadzeck was designated for assignment by the Brewers on Monday.
The Brewers selected Sadzeck's contract from Triple-A Nashville on Wednesday.
Sadzeck, who signed a minor-league contract with the Brewers on Dec. 1, received an invitation to MLB spring training.