Mariners seize – A road trip that started poorly ended with a statement: the Mariners swept the A’s, outscoring them 22-4, moving into first place in the AL West at 28-29 and setting up a key matchup with the D-backs after Kansas City.
WEST SACRAMENTO — The Mariners didn’t just fix a rough start. They buried it.
By the time the road trip that began in Kansas City had finished. the team that spent the season holding sky-high expectations hadn’t been playing catch-up anymore. It had taken the division perch they’d been chasing. doing it the only way that counts this late in the week—by sweeping the club ahead of them.
“This is as good as we’ve played all season long, and as consistent as we’ve been,” Mariners manager Dan Wilson said. “And again, it’s all parts of the game.”
The scoreboard made the series hard to argue with. The Mariners’ run differential over the A’s was +18 after they outscored Oakland 22-4. That number, usually best interpreted over a longer sample, arrived in a way that felt blunt and immediate.
Seattle entered the week with a +6 run differential on the season and headed home to face the D-backs at +24.
A sweep like this doesn’t happen on one side of the ball. The Mariners combined elite pitching with timely hitting in a way they haven’t managed in any of their 18 series this season, at least not together.
The Mariners’ arms posted a combined 1.33 ERA across the week. Offensively, they put together 10 or more hits in all three games—including Sunday’s loss in Kansas City.
What made it even more striking was who they were shutting down. The A’s came in with power and a profile built for a hitter-friendly environment. They still may not be far off from true contention, but they have plenty of thump waiting.
That threat showed up in the numbers Seattle put on the brakes. Oakland entered the series with a .394 slugging percentage ranked eighth-best in MLB, only to be held to a .299 clip over the three games.
And for many watchers, the headline moment belonged to Nick Kurtz.
Kurtz ended a 48-game on-base streak on Tuesday, then was held to 0-for-4 on Wednesday, with two strikeouts against Gilbert. For those who track these kinds of details, it wasn’t just command—it was speed.
Gilbert had a noticeable uptick in velocity on Wednesday, with his four-seam fastball up by an average of 1.1 mph to 96.4 mph.
“I’ve been trying to get there, honestly, and felt like I’ve been throwing the ball well at times,” Gilbert said. “I just didn’t quite have that velo. But to see it today, honestly, like, answered prayers.”
The Mariners also had to adjust their approach late, because the A’s were shifting their plans. With last-minute changes to install left-handed starters, Jeffrey Springs was bumped up for the finale.
For the series, Seattle went 19-for-57 (.333) against southpaws, including relievers. The work was led by Refsnyder’s big homer in the finale. But the context mattered—Seattle entered the week with an MLB-worst .190 batting average against lefties.
“I don’t blame them,” Refsnyder said. “We haven’t been very good against lefties. I haven’t really done my job up to this point, so yeah, I get it. But it was a great series for us. We’re in first place. Hopefully, we just keep it rolling.”
Refsnyder also revealed after the game that he’s been dealing with significant limitations to his right knee for most of the year, and that he’s now getting to a more palatable place.
“Some mechanical breakdowns came from some of that stuff, so kudos to the medical team for kind of pinpointing some stuff,” Refsnyder said.
The sequence of results has a clear shape: dominant run prevention, a hit-heavy response to left-handed pitching, and key stops on the A’s most dangerous hitters—enough to flip a standings race that had resisted Seattle for most of the season.
Still, first place at this point doesn’t mean what it will after the calendar flips.
Memorial Day, which was Monday, is typically the benchmark when the sport begins to look more closely at the standings. Seattle (28-29) is already benefiting from playing in arguably the weakest division—also the only one in baseball with a first-place team under .500.
The next step is more demanding. The club hasn’t been in first since it was 3-2 on March 30, and this kind of moment can slip away fast without a sustained run.
That’s the challenge ahead: turning a promising three-day stretch into something longer—because the Mariners know the standings reward consistency, not bursts.
For now, though, this week in West Sacramento feels like more than a correction. It feels like a springboard.
Mariners A's Nick Kurtz Gilbert Dan Wilson AL West sweep run differential Memorial Day Jeffrey Springs Refsnyder
Swept 22-4?? Man that’s wild.
I didn’t even know Seattle was in first?? Like I thought they were still messing around. Pitching + hitting at the same time is rare right??
Dan Wilson sounds confident but isn’t this just because Oakland was tired from traveling or something? 22-4 is crazy though, I’ll give him that. Also I’m confused why they play the D-backs next like that matters if it’s AL West standings or whatever.
Run differential +18 like overnight?? That seems fake like did they pull the best Mariners pitchers or something? I swear the A’s always have power until they don’t. And they say 1.33 ERA across the week but then mention a Kansas City loss too so I’m like… are they counting losses in the sweep week or what? Either way Seattle better not blow it after this.