The Mariners acquired Mastrobuoni from the Cubs on Tuesday in exchange for cash considerations, Meghan Montemurro of the Chicago Tribune reports.
The Cubs designated Mastrobuoni for assignment Thursday, Andy Martinez of Marquee Sports Network reports.
The Cubs optioned Mastrobuoni to Triple-A Iowa on Wednesday, Taylor McGregor of Marquee Sports Network reports.
The Cubs recalled Mastrobuoni from Triple-A Iowa on Sunday.
The Cubs optioned Mastrobuoni to Triple-A Iowa on Tuesday, Meghan Montemurro of the Chicago Tribune reports.
Mastrobuoni is out of the lineup for Sunday's game against the Diamondbacks.
Mastrobuoni will start at third base and bat seventh in Sunday's game against the Cardinals.
Mastrobuoni is out of the lineup for Wednesday's game against the Orioles.
Mastrobuoni will start at third base and bat eighth in Friday's game against the Angels.
Mastrobuoni was called up from Triple-A Iowa on Tuesday.