Mariners Game #25 Preview and Discussion: SAC at SEA, 4/21

Apr 20, 2026; Seattle, Washington, USA; Athletics right fielder Lawrence Butler (4) steals a base before Seattle Mariners second baseman Cole Young (2) can receive a throw during the fifth inning at T-Mobile Park. Mandatory Credit: Joe Nicholson-Imagn Images | Joe Nicholson-Imagn Images After coughing up a three-run lead in a loss last night, the Mariners hope to even the series against the Athletics Tuesday night. 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.