With Castillo Secured, Mariners Upgrade at Margins With Casali, Boyd, and Lamb

After getting ahead of the trade deadline frenzy by acquiring Luis Castillo on Friday, the Mariners spent Tuesday adding some depth around the roster, picking up Curt Casali and Matthew Boyd from the Giants in exchange for a couple of minor leaguers, right-handed reliever Michael Stryffeler and catcher Andy Thomas. In a separate deal, they also grabbed Jake Lamb from the Dodgers for a player to be named later or cash considerations.
Last week, Justin Choi broke down the adjustments that have led to a breakout season from Seattle’s full-time catcher Cal Raleigh. His excellence this year has helped the Mariners to a cumulative 1.6 WAR from their backstops, the 12th-highest mark in the majors. Unfortunately, nearly all of that production and then some has come from Raleigh alone. Luis Torrens has been the primary backup and one of the worst players in the majors this season, accumulating -0.7 WAR across 42 games. A year after hitting 15 home runs and putting up a 101 wRC+, he has sunk to a pitiful .208/.262/.225 slash line (46 wRC+) without a single home run, which is awful even by the lower standards for catchers.
With Tom Murphy sidelined for the year with a shoulder injury and no other options in the organization, Torrens’ struggles have forced the Mariners to ride Raleigh pretty hard. Since being recalled from Triple-A on May 7 following Murphy’s injury, he has played in 65 of Seattle’s 76 games, starting 55 of them, and has gotten exactly one full day off since June 24, when he sat out the second game of a double-header on July 13.
Casali is currently on the IL after suffering a strained oblique in early July but is in the middle of a rehab assignment and should be activated soon. When healthy, he has been a perfectly serviceable backup backstop for the Rays, Reds, and Giants, accumulating positive WAR in every season of his career except for his rookie campaign back in 2014. Over the last two seasons in San Francisco, he’s put up a .218/.317/.357 slash line (89 wRC+) and 0.8 WAR. He strikes out a little too often but has some power and can take a walk, and he’s a capable defender behind the plate, earning positive framing marks over the last three seasons, though that skill has fallen off a bit this year, down to -2.9 runs in just over 300 innings behind the plate. His familiarity with Castillo from his time in Cincinnati was also a big factor in acquiring him. Read the rest of this entry »