Michael Arroyo didn’t exactly get a long runway to prove himself in Seattle. He sat for four straight games while the Mariners, at least in theory, figured out what they had. When he finally got back into the lineup Saturday, he needed only six plate appearances to make the case that the evaluation should have started earlier.
In Seattle’s 19-1 rout of the Athletics, Arroyo went 3-for-4 with a double, his first major-league home run, a walk, three RBIs and no strikeouts. He reached base four times and also added an RBI sacrifice fly in his other trip to the plate.
The contact was loud from the start. Four of his five batted balls came off the bat at 100 mph or harder.
His first big-league hit was a 104 mph double off an 89 mph slider from Seth Johnson. Later, he crushed a home run that was projected at 418 feet and came off the bat at more than 103 mph.
He also lined an RBI single up the middle at 106.
Even the ninth-inning sacrifice fly against position player Carlos Cortes was hit at 100 mph. That one was more of a footnote - we’ve seen the other side of putting a position player on the mound this season - but the rest of the damage came against actual pitchers, and it wasn’t cheap.
One of the best looks at Arroyo came when Joey Estes had him down 0-2 with back-to-back fastballs. Arroyo swung through the first one and fouled off the second.
After that, he quit expanding the zone. He watched four straight pitches - a fastball, a sweeper and two more fastballs - and worked the walk.
Two innings later, when he saw Estes again, Arroyo was ready for a sinker with armside run that leaked to the inside half. He sent that pitch over the left-center-field wall.
That sequence said plenty. He absorbed the early trouble, picked up on what Estes was trying to do, and punished him the next time around.
The homer showed the power. The two plate appearances together showed an approach that can hold up against major-league pitching.
Seattle already had plenty of reasons to believe in that part of his game. Arroyo wrapped up his minor-league season with a 16.4 percent strikeout rate, an 8.1 percent walk rate and a 117 wRC+ across Double-A Arkansas and Triple-A Tacoma.
His call-up was supposed to answer whether that production would carry over. Instead, the Mariners barely used him.
Saturday was just his second start since arriving in the majors. What, exactly, were they waiting for?
This kind of performance doesn’t mean Arroyo should be handed anything. But the sample size is still tiny, and Seattle has every reason to keep playing him now.
He logged 66 minor-league games in left field and 41 at second base this season. Cole Young is set at the keystone, but Saturday also showed how that doesn’t have to be a dead end for Arroyo.
Young had three hits, homered and drove in five runs while Arroyo filled the designated hitter spot, giving Seattle a lineup where both bats could fit. That setup may not hold when a right-hander is on the mound and Lazaro Montes is on the roster too.
Still, the Mariners can move Arroyo around. They can use him in left field, at second base and at DH.
They can give Young a day off without pretending Arroyo has to replace him. And they can, at the very least, start Arroyo against right-handed pitching instead of limiting his audition to favorable left-on-right spots.
Versatility is supposed to create chances. Seattle has mostly used it to restrict them.
Whatever is left of the 2026 playoff math, these final weeks can still help answer questions for 2027. Arroyo’s defense may eventually define his role, but the Mariners can still learn something by finding out.
If he sits, they learn nothing.
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