Seattle Mariners Retain Miles Mastrobuoni After DFA

The Seattle Mariners will continue to have Miles Mastrobuoni as a depth option after he cleared waivers.

Mastrobuoni was outrighted to the Triple-A Tacoma Rainiers following his designation for assignment last week.

What happened to Miles Mastrobuoni?

The 30-year-old Mastrobuoni cleared waivers and was outrighted due to being short of three years of MLB service time.

He did not have the ability to reject his outright assignment.

Why was Miles Mastrobuoni designated for assignment?

The Mariners designated Mastrobuoni for assignment on June 19 to make room for recently signed veteran Weston Wilson.

Mastrobuoni hits from the left side, whereas Wilson is a right-handed hitter.

The Seattle Mariners are currently 3rd in the American League with a 42-41 record, on a W1 streak, after winning 1-3 at Cleveland Guardians on 2026-06-26.

What's next for Miles Mastrobuoni?

Mastrobuoni could return to the field when Tacoma hosts the Round Rock Express at 7:05 p.m. Friday at Cheney Stadium.

He has spent the majority of this season on the injured list after suffering a calf strain while playing for Italy in the World Baseball Classic in March.

Mastrobuoni played a full month on a minor league rehab assignment with Tacoma, then rejoined the Mariners in mid-June.

He played eight games while appearing at first base, second base, third base, and left field for Seattle.

Mastrobuoni went 5 for 23 (.217) at the plate in his short time back up with Seattle.

Last year, he slashed .250/.324/.296 for a .620 OPS with one homer and four doubles in career-high 76 games with the M's.

Mastrobuoni has played for the Tampa Bay Rays and Chicago Cubs before joining the Seattle Mariners.

The Mariners will open a three-game series in Cleveland at 4:10 p.m. Friday in a battle between the AL West leaders and one of the two teams tied atop the AL Central.