Mariners ALCS Roster: Bryan Woo Added, 13 Pitchers Selected (2025)

Hold onto your hats, baseball fans—the Seattle Mariners are shaking things up just in time for the American League Championship Series (ALCS), and it's got everyone buzzing about their chances against top-tier competition! But here's where it gets controversial: is prioritizing a 13-man pitching staff over versatile infielders and utility players a bold strategy or a risky gamble? Let's dive into the details of this roster tweak and unpack what it means for the team's postseason push.

First off, for those new to the playoffs, the ALCS is the semifinal round where winners from the American League Division Series clash to advance to the World Series. It's high-stakes baseball, and roster decisions can make or break a series. On Sunday, the Mariners made a notable addition: right-hander Bryan Woo (check out his MLB profile at https://www.mlb.com/player/693433) joined Seattle's 26-man ALCS roster. However, fans, here's the kicker—he won't be in the mix for Game 1 at all, leaving him sidelined for what could be a pivotal opener.

To accommodate Woo, the team had to make some tough calls. Infielder Ben Williamson (https://www.mlb.com/player/810938) and utility man Luke Raley (https://www.mlb.com/player/670042) were both left off the roster for this series, while infielder/outfielder Miles Mastrobuoni (https://www.mlb.com/player/670156) stepped in as a new addition. This shift leans heavily into a 13-man pitching staff, emphasizing bullpen depth over extra bats on the bench. For beginners, think of it like this: in baseball playoffs, teams can carry up to 40 players in the postseason pool, but only 26 per series. Swapping players allows managers to tailor the squad to specific strengths, like a stronger pitching arsenal, which could be crucial in close games.

And this is the part most people miss: why not keep all-star talents like Williamson, who brings defensive versatility, or Raley, known for his clutch hitting? Some might argue it's a smart, data-driven move to protect pitching arms in a grueling series, but others wonder if it's undervaluing the offense, especially against power-hitting opponents. Is this a sign of overconfidence in the rotation, or just prudent planning for marathon games? Pitching staffs are often the unsung heroes in playoffs, but sacrificing positional flexibility might backfire if injuries strike or key hits are needed.

Mark your calendars for ALCS Game 1, brought to you by loanDepot—it's kicking off Sunday at 8 p.m. ET (5 p.m. PT) on FOX. You can catch all the playoff schedules and updates at https://www.mlb.com/news/2025-mlb-playoff-and-world-series-schedule. And hey, if you're itching to cheer from the stands, grab your Mariners postseason tickets at https://www.mlb.com/mariners/tickets/postseason?affiliateId=mlbcomarticle-inline-linksea.

The Mariners tweeted about it with that iconic "Lock it in 🔒 #SeizeTheMoment" vibe, sharing a pic at https://t.co/gXrBeOnket (original tweet from @Mariners on October 12, 2025: https://twitter.com/Mariners/status/1977388796074229923?ref_src=twsrc%5Etfw). It perfectly captures the team's rallying cry to seize the moment.

What do you think, fans? Does this roster shake-up scream championship strategy, or is it a controversial choice that might haunt the Mariners? Do you agree with sidelining Woo for Game 1, or should they have prioritized hitters like Williamson and Raley? Share your hot takes in the comments—let's debate and see if this decision pays off!

Mariners ALCS Roster: Bryan Woo Added, 13 Pitchers Selected (2025)

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