A blockbuster trade with the Red Sox could help the Mariners pursuit of Christian Walker.
Even though the Sox just traded for Garrett Crochet, they need pitching this offseason, and the Mariners have a ton of top-line starters at their disposal that they could be comfortable moving off of. Recent rumors have popped up suggesting that Boston could pursue a trade for Luis Castillo, as that would help Seattle free up the money needed to make a serious run for Walker.
“The hitter the Mariners would love to get is Christian Walker, which for now is out of their price range. As another GM suggested this morning, ‘Craig Breslow is tireless, he’s really smart, and if he can clear Castillo’s money, give Seattle help elsewhere and allow them to get Walker, maybe he gets Castillo,’” Peter Gammons reported on X, formerly Twitter.
Should Mariners trade Luis Castillo to Red Sox, pursue Christian Walker?

Of course, the Mariners aren’t just going to give Castillo, who is still an ace-caliber pitcher, to the Red Sox for free, and trading him just to have a shot at landing Walker would be a big risk. Boston is remaining relentless in their pursuit of a pitcher from Seattle, though, and maybe this angle will help them be able to pull off their second blockbuster trade for a starter this offseason.