Luis Castillo hasn’t looked like himself for most of this season. The Seattle Mariners right-hander, once a dominant force at the top of a rotation, entered play with a 3-7 record and a 4.79 ERA. That’s not what you expect from a guy making $22.75 million this year.
But here’s the thing. Over his last 44 1/3 innings, dating back to mid-May, Castillo has posted a 3.25 ERA. He’s looked sharper. The sinker has more life. The changeup is generating swings and misses again. By all accounts, he’s returning to form.
And that might actually get him traded.
The math behind the move
The Athletic’s Ken Rosenthal reported that the Mariners’ willingness to deal a starter has only grown stronger as Castillo has found his rhythm. Seattle currently runs a six-man rotation, a luxury that has kept arms fresh and helped the team hold onto first place in the AL West. But it’s also created a surplus.
Castillo is the highest-paid player on the roster. The Mariners have a rotation full of cost-controlled arms — Logan Gilbert, George Kirby, Bryce Miller, Bryan Woo, and Emerson Hancock — who are all younger and cheaper. Castillo’s contract isn’t a problem in a vacuum. It’s a problem when you consider what else the team needs.
Seattle could use a reliable reliever and a right-handed bat. Those aren’t cheap at the trade deadline. Moving Castillo would free up significant payroll and bring back a haul of talent that could address both needs at once.
Timing matters
The Mariners started their unique piggyback system — rotating starters through the bullpen — around the same time Castillo began pitching better. That’s not a coincidence. Having six capable starters allows Seattle to be patient with a guy shaking off rust. It also lets them show off a hot commodity.
If Castillo had continued to struggle, trading him would’ve been difficult. Nobody wants to take on a $22.75 million pitcher who looks broken. But now that he’s flashing his old self, other teams have a reason to pick up the phone. The Mariners have a better chance of finding a partner willing to absorb that salary if they believe they’re getting the real Castillo down the stretch.
It’s a weird situation. The guy is finally pitching like an ace again, and that might be exactly why Seattle lets him go. But that’s how these things work in a sport where the luxury of depth can force a tough decision.
The team has not confirmed any trade discussions. Rosenthal’s reporting, however, lines up with the general logic of a club that is competitive now but wants to stay competitive for years. Castillo’s return to form gives the Mariners options. It doesn’t guarantee he stays.
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