4 rule-breaking trades with AL West rivals that would elevate Mariners

It's a big no-no for division rivals to trade with one another. But as Seattle Mariners fans know from when the team traded Kendall Graveman to the Houston Astros amid a 90-win season in 2021, sometimes the impossible does happen.

That's one rationale for the exercise that's about to unfold. Another is that it's just plain fun, with still another (and more important) one being that Jerry Dipoto can't limit his options as the August 3 trade deadline gets closer. Especially not while there are players in the AL West who could help.

So, here are four extremely unlikely, yet undeniably compelling trades the Mariners could make with AL West rivals.

These 4 trades with AL West rivals would fill major needs for the Mariners

With the Los Angeles Angels: INF Nick Becker for INF Oswald Peraza

With J.P. Crawford and Brendan Donovan on the injured list, the Mariners are thinner on the infield than they want to be. And even once Donovan is back, he's almost certainly ticketed for more playing time in the outfield and at designated hitter.

What the Mariners will really need is a right-handed-hitting infielder to balance out an infield with four lefty-hitting starters. Peraza is ideal, as he's started games at all four spots and has broken out in 2026 precisely because he's crushed lefties. He has an .877 OPS against them.

With their farm system rated as one of the worst in MLB, the Angels need whatever prospect help they can get. Swapping out Peraza for Becker would accomplish that, effectively turning a mildly exciting breakout into MLB Pipeline's No. 10 prospect from one of the league's deepest systems.

With the Texas Rangers: C Luke Stevenson for LHP Jacob Latz

This is a hard sell as things stand now. The Rangers are pursuing the Mariners in the AL West, and that has a lot to do with how much Latz has meant to a bullpen that's tied for fifth in MLB with a 3.35 ERA.

If the Rangers do fall behind, though, Latz needs to be on Dipoto's radar. He's quietly been gaining steam over the last few years, and is now just plain hot with a 1.69 ERA through 25 appearances this year. And he's no lefty specialist, as even righties are only 5-for-60 against him.

Latz would be a godsend for a Mariners bullpen that needs both depth and another late-inning weapon. And whereas Stevenson sees Cal Raleigh when he looks up Seattle's depth chart, he'd be a prized prospect (currently No. 8 for the Mariners) with a clear path to a major league gig in the Rangers system.

With the Athletics: RHP Luis Castillo, OF Yorger Bautista for DH Brent Rooker

Rooker was hot off a star turn when the A's signed him to a five-year, $60 million extension in January of 2025, yet things have since gone awry for the 31-year-old. His OPS dipped by over 100 points from 2024 to 2025, and is now down to .670 in 2026. He's currently on the IL for the second time this year with a bone bruise in his knee.

So, he's a depreciated asset. So is Castillo. And between their two contracts, there's only about a $10 million difference in remaining dollars. Add a mid-level prospect like Bautista, and the two sides of the equation would balance out nicely.

Whereas Castillo's deal is finished in 2027, this deal would get the A's out of paying Rooker through 2029. The Mariners could hope for a change of scenery spark on Rooker's part, and could aim to strike it by shifting his playing time to be mostly against lefties. He had a .900 OPS against them between 2023 and 2025.

With the Houston Astros: RHP Luis Castillo for LHP Josh Hader

Yup. Straight-up. No muss, no fuss. And at least according to Baseball Trade Values, it's a fair trade.

In all likelihood, the Astros would consider it only if they fall so far out of the race that saving some money becomes the best way to save face. To this end, they're already six games under .500. Ace closers are wasted on teams like that, and this one just got the first major injury scare of his career.

For Houston, this trade would swap out $48.8 million owed through 2028 for $35.7 million owed through 2027. For Seattle, the extra payroll hit would be worth it if Hader lived up to his track record as a six-time All-Star with the highest strikeout rate of any pitcher in history.

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