Josh Naylor arrived in Seattle as one of the offseason’s biggest bets, the kind of move that was supposed to give the Mariners a real thump at first base. The deal came together quickly, just a few weeks after the World Series, and both sides sounded eager to get it done. At the time, it looked like the Mariners had landed a legitimate offensive upgrade.
That hasn’t played out the way anyone expected.
Naylor was excellent after coming over from the Diamondbacks last year, putting up a 137 OPS+ with 19 stolen bases and 2.2 rWAR in 210 plate appearances. This season, across 400 plate appearances, he’s sitting on a 93 OPS+ and -0.1 rWAR. He’s one of several Mariners who have slipped, but his drop-off is harder to pin down than most.
The new Statcast percentile comparison tool in Baseball Savant helps show why the issue is so murky. When Naylor’s 2025 and 2026 numbers are stacked side by side, the usual red flags don’t jump out.
He’s actually chasing less, whiffing less, and striking out less than his peers, while getting optimal launch angles almost four times as often. On the surface, that doesn’t look like a hitter completely out of sorts.
The problem is that the damage has shown up in his contact quality. His average exit velocity, hard-hit rate, and barrel rate have all fallen. The drop isn’t massive, but his 87.6 mph average exit velocity is low enough to stand out, landing him in the same neighborhood as light-hitting middle infielders like Ezequiel Tovar (87.2 mph) and Xavier Edwards (87.1 mph).
It can feel like Naylor is pounding the ball into the ground more often, especially with 14 grounded into double plays, which ranks third in MLB. But his ground-ball rate is actually 43.8%, down from his career mark of 47.1%. He is popping up more, and he’s also pulling the ball in the air more often, so the overall batted-ball picture isn’t disastrous.
That’s part of what makes this so tricky. Cal Raleigh’s issues are more visible, and he’s been more direct about what he wants to do to fix them.
Naylor’s slump is harder to read, and Raleigh’s struggles have helped cover it up. The Mariners’ front office still appears to trust both hitters, but if Naylor doesn’t get going, he could become another problem Seattle has to work around in the second half.
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The roster ripple effect is part of the appeal and part of the complication. Adding another infielder would only deepen the crowd around Colt Emerson, Cole Young, JP Crawford and Josh Naylor, while the price tag could force Seattle to weigh prospects such as Felnin Celesten, Lazaro Montes and Michael Arroyo against bigger-league pieces. ESPNs Buster Olney also singled out one of the bats as the likelier fit, which only adds to the sense that this is a name worth tracking as the deadline gets closer. [Read more 🡒]
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For Seattle, the timing matters because this was a core part of Everetts next wave, a collection of players who had spent the first half building real momentum. The group includes a breakout bat, a high-average contact hitter, a healthy rebound story and a versatile piece who helped finish the job in a title-clinching win, so the AquaSox are not just losing depth, they are losing some of the energy that had defined the roster. The next question is whether Everett can keep that momentum going while the organization keeps pushing its most advanced talent one level closer to the big leagues. [Read more 🡒]