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# 5 Best MLB Trade Pieces Mariners Have If They Sell at Deadline
- URL: https://www.emeraldcityspectrum.com/5-best-trade-pieces-mariners-have-if-they-sell-at-deadline/
- Published: 2025-06-15T00:07:08.000Z
- Updated: 2026-10-08T05:37:13.000Z
- Author: Corbin Smith
- Tags: Mariners, Andres Munoz, J.P. Crawford, Gabe Speier, Luis Castillo, Randy Arozarena

[Embed from Getty Images](http://www.gettyimages.com/detail/2220036136?ref=emeraldcityspectrum.com)

Losers of 20 of their last 32 games, the Mariners have seen their long-held lead of the American League West disappear and now trail the Astros by 4.5 games. That certainly isn’t anywhere close to an insurmountable deficit, especially in mid June, but with a laundry list of key injuries and reasonable talent questions, it’s not hard to foresee things going from bad to worse for Seattle in the weeks leading up to the July 31 trade deadline.

If that does wind up being the case, it would put the Mariners in position to be one of MLB’s few true selling teams in what is expected to be a trade market that will heavily favor sellers. There would also be a strong argument to be had that no team could match the crop of players they could make available. Let’s take a look at what they’d have to offer if that’s the path they wind up going down. 

### Andrés Muñoz

Muñoz has been one of baseball’s best bullpen arms this year and is a likely All-Star selection, ranking sixth in ERA (1.30), 12th in FIP (2.14), 23rd in K/9 (11.71), tied-fifth in fWAR (1.1), and third in win probability added (2.56) among all qualified relievers. He’s only 26 years old and is under club and cost control for three more seasons beyond 2025 at incredibly team-friendly increments of $6 million, $8 million, and $10 million. Considering the kind of hauls relievers such as Tanner Scott and Aroldis Chapman have commanded with just two months left of club control, trading Muñoz could net the Mariners an astronomical return. But that high price may also drive teams away from him and lead them to cheaper, shorter-term options.

### J.P. Crawford

Crawford is hitting like it’s 2023 again and there aren’t going to be many up-the-middle players available this summer. Making just $11 million this year and set to make $12 million next year, the 30-year old shortstop is a financial bargain for the level of production he’s putting up right now, which includes a .286/.399/.393 slash line with a 138 wRC+ and 1.9 fWAR. Given how weak the trade market is shaping up to be, what Crawford is doing with the bat, the position he plays, and his extra year of club control could make him the most valuable position player that gets moved at the deadline. 

### Gabe Speier

Finally healthy after an injury-filled 2024 campaign, Speier has quietly been nearly as valuable as Muñoz this season, sporting a 2.16 ERA, 2.00 FIP, 13.32 K/9, 50 percent groundball rate, 0.7 fWAR, and 0.67 win probability added at the time of this writing. Very few left-handed relievers have been better than Speier this year, though some teams may pause at the .260/.327/.460 slash line right-handed hitters have against him and wonder just how viable of an option he is against the opposite handedness. Those aren’t necessarily terrible numbers relative to other southpaw relievers, though, and he’s also been able to miss righty bats with roughly the same amount of consistency as he has against lefties. Teams will see a lot of value in that, as well as the two additional years of club control he has beyond this season, and the return he could command as a result might shock some unfamiliar with his body of work. 

### Luis Castillo

Castillo was a popular name in trade rumors this past winter, so his inclusion here is an obvious one. The only potential hang-up is the remaining presence of his no-trade clause, which doesn’t expire until January 1, potentially narrowing the Mariners’ list of trade partners and diminishing some of their leverage in negotiations. Nevertheless, Castillo could very well be the best starting pitcher available at the deadline this summer, carrying a 3.29 ERA and 3.88 FIP in 79.1 innings pitched despite a few rough starts here and there. He’s certainly regressed, as evidenced by a career-low 7.60 K/9, and won’t command the kind of return the Mariners forked up for him in 2022, but teams are going to value his veteran presence, experience, and the fact he’s still been able to find ways to compete at a high level. 

### Randy Arozarena

With one fewer year of club control left on Arozarena’s rookie contract, the Mariners aren’t going to get a return similar to what they paid for him last summer, but they still should be able to get something decent. Despite being in the midst of a second consecutive season where he’s putting up a batting average and slugging percentage well below his career norms, the 30-year old outfielder is still running a 120 wRC+ and has been one of Seattle’s best hitters in big moments. The allure of “Playoff Randy” will certainly make him one of the more sought-after bats by contenders should he be available. 

**Other notable names:** Matt Brash, Dylan Moore, Jorge Polanco