Complete list of former Mariners players involved in Rays-Brewers World Series

The Seattle Mariners don't exactly have much familiarity with the World Series, remaining as the only MLB organization never to have had a chance to participate in the Fall Classic. However, that doesn't mean the team isn't familiar with some of the players participating in this year's contest.

Between the Rays and Brewers, here are all of the players (sorry, Daniel Vogelbach, but this is not counting coaches) you may recognize as former members of the organization.

All the former Seattle Mariners you can watch in the Rays-Brewers World Series

Ben Williamson, Tampa Bay Rays

The most recent Mariner between Milwaukee and Tampa Bay, Williamson was Seattle's starting third baseman for much of last year. He was selected in the second round of the 2023 draft out of the College of William and Mary. He initially benefited from a lack of roster competition in the hot corner, but was sent down following the Mariners' reunion with Eugenio Suarez.

Prior to the start of 2026, the impending debut of Colt Emerson meant that the team had an excess of infielders and Williamson was the most glaring redundancy, especially after struggling to hold his own against big-league pitching. He was sent to Tampa Bay as part of a three-team trade that netted Seattle Brendan Donovan from the Cardinals.

His numbers this season were on par with what they were last year, culminating in a 74 OPS+ and 0.8 rWAR over 295 plate appearances. He was slightly less productive than last year over a similar amount of plate appearances, mostly due to a dip in defensive output, but he was a useful utility infielder for the Rays who had him play four positions, including five innings as pitcher.

Jake Bauers, Milwaukee Brewers

Those who remember his time on the Mariners may be surprised that he had a wRC+ of 143 this year, seventh in MLB and higher than the likes of Junior Caminero, Elly De La Cruz, and Shohei Ohtani. He was traded from Cleveland to Seattle all the way back in 2021 after being designated for assignment. The return package? Cash, or a player to be named later. His numbers as a Mariner weren't much to write home about and he posted a 63 OPS+ over 202 plate appearances.

He hit free agency at the end of the season but wouldn't return to the majors until getting called up by the Yankees in 2023. He arrived in Milwaukee following a forgettable trade in 2023 and hit his stride in 2025, posting an OPS+ above 100 for the first time in his six major league seasons. With his success this year and a relatively thin position player class, he could be in for a surprisingly lucrative free agent contract this offseason.

Freddy Peralta, Tampa Bay Rays

Though Freddy Peralta never pitched for Seattle, he did make his professional debut for the organization. After signing as an international free agent in 2013, he pitched for the Mariners' Dominican Summer League and Arizona League teams, spending his first three seasons learning the ropes in rookie ball.

He and two other pitching prospects were traded to the Brewers in exchange for Adam Lind, a deal that the organization likely regrets given Lind's poor numbers in 2016. With Milwaukee, Peralta gradually ascended to be the team's ace before being sent to the Mets in his final year of club control.

He regressed quite a bit while in Queens, posting a 4.99 ERA with a 4.46 FIP over 113.2 innings. Still, he was a starting pitcher with some potential left, prompting Tampa Bay to pick him up at the deadline. He improved significantly with his new team, finishing the year with a 3.25 ERA in his last 10 starts and recently put on a stellar postseason performance, culminating in winning the ALCS MVP.

Brody Hopkins, Tampa Bay Rays

Hopkins was a 2023 sixth-round selection for the Mariners out of Winthrop University and immediately landed as the organization's No. 26 prospect. Scouts were primarily excited about his four-seam/slider combination, but Mariners fans would get only 18 starts from him in Single-A before he was sent to the Rays in the Randy Arozarena trade.

Though his numbers in Triple-A weren't particularly compelling, he was called up in mid-September of this year on account of his outstanding intrinsic characteristics, otherwise known as "stuff." He made just six big league appearances for the Rays, posting a 5.06 ERA and 6.29 FIP, but was added to the ALCS roster nonetheless. He's still waiting to make his playoff debut for Tampa Bay and in what's bound to be a hard-fought series against the Brewers, he just might get his chance next week.

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