Shewmake rejected an outright assignment to Triple-A Nashville and elected free agency Tuesday, Todd Rosiak of the Milwaukee Journal Sentinel reports.
The utility infielder was designated for assignment by the Brewers last week and had the ability to reject an outright assignment since he's been DFA'd before. Shewmake has played in 34 games between Houston and Milwaukee this season and has generated a .259/.270/.424 slash line with four home runs in 91 plate appearances.