Luis Castillo gets the ball for the M’s, still in search of his first win of 2026 in his fifth start. With a 5.40 ERA this season, the results haven’t been on La Piedra’s side to this point, though his 3.30 FIP suggests some bad luck.
Last time out in San Diego, Castillo allowed quite a bit of hard contact for one earned run over 5.1 innings — though that line is a tad deceiving. He gave up four runs in total, all of which came during an ill-fated second inning in which he made an error on a throw to Josh Naylor at first that maybe should’ve been picked, making three of the runs unearned. All in all, no one is accusing the Mariners infield of putting on a defensive clinic lately, but Castillo didn’t exactly look sharp either. He’ll look to bounce back in the friendly confines of T-Mobile Park.
The Athletics will counter with Jacob Lopez (1-1, 6.38 ERA), who is also making his fifth start of the season. For more on the pitching matchup, you can check out the series preview written by Jake Mailhot.
In other news this afternoon, the Mariners designated RHP Casey Legumina for assignment in the aftermath of his losing decision last night. As a corresponding move, RHP Alex Hoppe was recalled from Triple-A Tacoma and will join the Mariners bullpen. His first appearance will be his major league debut. John Trupin wrote about the roster move here.
The Mariners are rolling out their righty platoon to face the lefty Lopez. Cal Raleigh will get a DH day while Mitch Garver is behind the dish. With Rob Refsnyder in the lineup batting leadoff, J.P. Crawford slots down to sixth.
First Pitch: 6:40 p.m. PDT
TV: Mariners.TV, with Aaron Goldsmith, Ryon Healy and Ryan Rowland-Smith
Radio: 710 AM Seattle Sports, with Rick Rizzs and Gary Hill Jr.
