Mariners' Miles Mastrobuoni: Sticking in organization
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Mastrobuoni cleared waivers Tuesday and was outrighted to Triple-A Tacoma.
Mastrobuoni was dropped from the active and 40-man rosters Saturday to make room for Julio Rodriguez's (leg) return from the IL, but the former will officially remain in the Mariners' system after passing through waivers unclaimed. Mastrobuoni, 30, has slashed just .172/.310/.293 through 71 plate appearances at Tacoma and is likely to spend the vast majority of what's left in the season at Triple-A.
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Mariners' Miles Mastrobuoni: DFA'd by Seattle
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The Mariners designated Mastrobuoni for assignment Saturday.
After having his contract selected by Seattle on July 3, Mastrobuoni made only three at-bats for the big-league club before being DFA'd on Saturday. This marks the second time the 30-year-old has been designated for assignment by Seattle this campaign. With Julio Rodriguez coming back from the 7-day injured list, the Mariners needed to make room for him on the active roster.
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Mariners' Miles Mastrobuoni: Back with Seattle
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The Mariners selected Mastrobuoni's contract from Triple-A Tacoma on Friday.
Mastrobuoni was DFA'd by the Mariners in mid-June but is back with the big club to provide depth in the outfield after Julio Rodriguez (concussion) was placed on the 7-day injured list. Mastrobuoni has spent most of the 2026 season in Triple-A, where he has a .603 OPS with five steals, one home run and three RBI over 71 plate appearances.
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Mariners' Miles Mastrobuoni: Outrighted to Tacoma
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Mastrobuoni cleared waivers Thursday and was sent outright to Triple-A Tacoma.
Mastrobuoni was DFA'd by Seattle after going 5-for-23 with 10 strikeouts in eight games with the big club, and he'll officially remain in the organization after passing through waivers unclaimed. The 30-year-old has posted just a .649 OPS at Triple-A this season and will likely spend the vast majority of what's left of the season in the minors.
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Mariners' Miles Mastrobuoni: Begins rehab assignment
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Mastrobuoni (calf) began a rehab assignment Monday with the Mariners' Arizona Complex League affiliate, going 0-for-2 with a 1:1 K:BB.
It was his first game action in more than four weeks, as he is working his way back from a right calf strain. The utility player should move up to a higher affiliate soon and is tracking toward a return in early June.
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Mariners' Miles Mastrobuoni: Moved to 60-day IL
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Seattle transferred Mastrobuoni (calf) from the 10-day injured list to the 60-day IL on Monday.
Mastrobuoni had been in the midst of a rehab assignment with Triple-A Tacoma and appeared to be on the cusp of a return from the 10-day IL, but his move to the 60-day IL likely indicates that he suffered some sort of setback over the weekend. As a result of the transaction, Mastrobuoni now won't be eligible to make his 2026 debut with the Mariners until the final week of May, though an exact timeline for his activation is unclear. The utility player initially suffered the right calf strain in March while playing for Team Italy in the World Baseball Classic.
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Mariners' Miles Mastrobuoni: Kicks off rehab assignment
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Mastrobuoni (calf) went 0-for-2 with a pair of walks in his first rehab game with Triple-A Tacoma on Wednesday.
Mastrobuoni has finally been cleared for games after suffering a right calf strain nearly a month ago. It's unclear how many rehab games the Mariners will ask the utility player to play, but it figures to at least be a handful.
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Mariners' Miles Mastrobuoni: Sidelined with calf strain
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The Mariners placed Mastrobuoni (calf) on the 10-day injured list Wednesday.
Mastrobuoni strained his right calf while playing for Team Italy in the World Baseball Classic two weeks ago. He'll be eligible to return April 1, but the utility player figures to require a bit more down time than that.
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Mariners' Miles Mastrobuoni: Smacks grand slam in spring debut
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Mastrobuoni went 2-for-2 with a double and a grand slam in Saturday's Cactus League matchup with the Giants.
It was a strong start to the spring for Mastrobuoni, who got the start in left field Saturday. He put the Mariners ahead early with his first-inning grand slam off Hayden Birdsong. Mastrobuoni, who hit just one home run while posting a .620 OPS in 175 plate appearances last season, has a shot to make Seattle's Opening Day roster as a bench option thanks to his positional versatility.
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Mariners' Miles Mastrobuoni: Sent to Tacoma
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Seattle optioned Mastrobuoni to Triple-A Tacoma on Friday.
Mastrobuoni will yield his spot n the 26-man roster to Luke Raley, who was activated off the injured list in a corresponding move. Mastrobuoni went hitless in two at-bats during his 16-day MLB stint.
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Mariners' Miles Mastrobuoni: Continues to hit for average
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Mastrobuoni went 2-for-3 with a walk, a run scored and a stolen base in Sunday's 11-3 loss to Houston.
The lefty-hitting Mastrobuoni continues to work in tandem with Ben Williamson for reps at third base, though the former has been functioning on the short side of the platoon for most of the year. While Mastrobuoni is batting a strong .314 (16-for-51) with four RBI, five walks and three steals over 26 games since the start of June, he has zero extra-base hits since May 23.
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Mariners' Miles Mastrobuoni: Sitting Friday
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Mastrobuoni is not in the Mariners' starting lineup against the Guardians on Friday.
Mastrobuoni has been out of the lineup in three of the Mariners' last four games, and his playing time could diminish further with Luke Raley (oblique) close to returning from the 10-day injured list. Randy Arozarena, Julio Rodriguez and Dominic Canzone will start in the outfield for Seattle.
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Mariners' Miles Mastrobuoni: Notches steal in loss
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Mastrobuoni went 1-for-2 with a walk, one stolen base and one run scored in Saturday's 8-6 loss to the Angels.
Mastrobuoni continues to fill a part-time role as a utility player. The 29-year-old's steal was his third of the season and his first since May 7 versus the Athletics. He's gone 4-for-8 across five games in June, but his inconsistent playing time limits any potential upside. For the year, he's slashing .243/.325/.301 with one home run, eight RBI, 13 runs scored and three doubles over 120 plate appearances.
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Mariners' Miles Mastrobuoni: Retreating to bench Monday
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Mastrobuoni is out of the lineup for Monday's game against the White Sox.
Mastrobuoni had started in each of the last four games at three different positions (second base, third base and right field), but he went just 1-for-11 with four strikeouts during that stretch. He'll be back on the bench Monday and should continue to serve as a utility player for Seattle, with his ability to play multiple outfield and infield spots enabling him to make a handful of starts per week.
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Mariners' Miles Mastrobuoni: On bench against southpaw
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Mastrobuoni is out of the lineup for Wednesday's game against the Angels.
With southpaw Tyler Anderson taking the hill for the Angels, the left-handed-hitting Mastrobuoni will take a seat after he started at four different positions (second base, third base, left field and right field) in Seattle's previous four games. Though he doesn't have a regular home in the infield or outfield, Mastrobuoni could continue to see fairly steady playing time against right-handed pitching while Dylan Moore (hip) and Luke Raley (oblique) are on the injured list and while Jorge Polanco (side) is limited to the designated-hitter role.
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Mariners' Miles Mastrobuoni: Not starting against lefty
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Mastrobuoni is out of the lineup for Wednesday's game against the Red Sox.
Mastrobuoni had started in each of the Mariners' last four matchups versus right-handed pitching, but he'll hit the bench Wednesday while the Red Sox send southpaw Sean Newcomb to the bump. The Mariners will likely continue to deploy Mastrobuoni in a timeshare at third base with Ben Williamson until Jorge Polanco is cleared to play the field again while he manages a side injury.
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Mariners' Miles Mastrobuoni: Getting third straight start
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Mastrobuoni will start at third base and bat seventh in Sunday's game against the Rangers.
Mastrobuoni will stick in the lineup for a fourth straight game and will make his third consecutive start at the hot corner while Jorge Polanco (side) is limited to DH duties. Polanco is believed to be at least one or two weeks away from being ready to play the field, so Mastrobuoni could continue to benefit from extra opportunities. The 29-year-old is hitting .316 through his first 10 games with the Mariners, but he hasn't provided much help in the counting categories (zero home runs, one stolen base, three runs and zero RBI).
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Mariners' Miles Mastrobuoni: Drawing second start of season
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Mastrobuoni will start at second base and bat eighth in Wednesday's game against the Astros.
Mastrobuoni will pick up his second start of the season, filling in at the keystone after the Mariners placed everyday second baseman Ryan Bliss (bicep) on the 10-day injured list. Though Bliss appears headed for an extended absence, Mastrobuoni won't necessarily be the Mariners' top choice to replace him. Dylan Moore will start at third base Wednesday, but he could shift over to second base and serve as the primary option at that position once Jorge Polanco (side) -- who is serving as a designated hitter against the Astros -- is cleared to return to the infield.
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Mariners' Miles Mastrobuoni: Dealt to Seattle
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The Mariners acquired Mastrobuoni from the Cubs on Tuesday in exchange for cash considerations, Meghan Montemurro of the Chicago Tribune reports.
Mastrobuoni had been designated for assignment but will now get to join a new 40-man roster. A .219/.279/.263 hitter across 272 career plate appearances in the majors, the utility player will compete for a reserve role this spring but does have minor-league options remaining.
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Cubs' Miles Mastrobuoni: Loses 40-man spot
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The Cubs designated Mastrobuoni for assignment Thursday, Andy Martinez of Marquee Sports Network reports.
The 29-year-old will end up as the Cubs' roster casualty following the acquisition of Matt Festa from Texas on Thursday. Mastrobuoni has slashed just .219/.279/.263 across 272 career plate appearances in the majors, and his .634 OPS at Triple-A Iowa last season could cause him to pass through waivers unclaimed.
