The Mariners announced today they have selected INF/OF Weston Wilson from Triple-A Tacoma and designated INF/OF Miles Mastrobuoni for assignment.
Wilson, who’s played parts of seasons in the big leagues since 2023, was signed to a minor-league contract by the Mariners five days ago, on June 14, and played just two games with the Tacoma Rainiers before coming up. His most significant big-league experience came with Philadelphia in 2025, when he appeared in over 50 games for the Phillies. Like Mastrobuoni,
Weston is a true superutility player who can play both infield and outfield – he’s largely played third base and left field – but unlike Mastrobuoni, he is a right-handed hitter. Boston will be throwing three lefties over the series in Seattle, prompting the move. Wilson will be in the lineup tonight, giving J.P. Crawford a rest day as he continues to work back from a stint on the IL with an injured hand.
It’s a really tough break for Mastrobuoni, who like Jhonny Pereda before him, was simply a victim of the numbers game. The Mariners are incredibly lefty-heavy as a roster and team are deliberately stacking left-handed starters against them for that reason, relegating players like Luke Raley, who struggles against lefties, to the bench.
It’s especially tough for Mastrobuoni – who my phone’s transcription app refers to as “Mister Bunny” or “Master Boney” depending on who’s speaking – as he played a pivotal role in the Mariners’ series win yesterday, making a spot start in left field – a position he doesn’t know well – and contributing at the plate. I have written before about how Mastrobuoni was one of the rare productive pinch-hitters for the Mariners last year, something he was working his way back to for brief time with the team after being recalled on June 10. Postgame yesterday, Mastrobuoni received praise from his manager, Dan Wilson, as well as his teammates, many of whom spoke on the importance of the role players like Mastrobuoni have on a team as decimated by injuries as the 2026 Mariners.
Starter Bryan Woo, who was helped out by several plays made by Mastrobuoni in the outfield, praised Mastrobuoni as a reflection of team health overall:
“It’s just the DNA of a good team and also close-knit clubhouse that you have guys that go down, and the next guy comes up and does his job and helps the team run, and that’s all you can really ask for, regardless of whether you see the results on the field or not. Like Mastro coming out and playing the left field that he did today – I don’t know if he’s played left field since coming up, he’s played first and third, also positions that he’s not comfortable at, and he goes out in left field and makes play after play after play. So it’s just, staying ready, and then when the opportunity comes, taking advantage of it.”
Colt Emerson was even more direct.
“Guys like that are the reasons why we succeed and we win games.”
Now it will be up to Weston Wilson – not to be confused with Will Wilson, another third baseman who stepped in at times to help the Mariners before going on the 60-day IL with his own injury, a fractured thumb – to continue that streak of role players who help the team win games while several players remain on the shelf.
