Logan Evans’ future depends on two numbers from his rookie season:
- .529 OPS allowed on the first turn through a lineup in a game (fifth best in MLB)
- 1.022 OPS allowed on the second turn through a lineup in a game (worst in MLB)
That .493 difference was the largest such split in 2025 and one of the 20 largest splits in MLB history. Which number better reflects his true talent?
OPS allowed isn’t the ideal measure for pitchers. I use it here as it’s the parlance of Baseball Reference, which facilitates the comparison. The next plot shows performance against this split using FIP (courtesy of Fangraphs). Here we see a less extreme split, with Evans performing closer to average on the first time through the order, while still the worst in MLB on the second.
Evans’ (relative) success on the first time through the order was thanks to an outstanding ability to limit quality of contact. He didn’t get a lot of whiffs or strikeouts, and his command was just OK. But batters simply could not square up the ball in their first look, either rolling over or getting jammed or popping up or otherwise juuuuuust missing. His .289 xwOBAcon allowed on the first time through the order was sixth in MLB.
On the second time through the order, he was awful by every metric.
The most likely explanation for this phenomenon is that sometimes bizarre splits show up in small samples; Evans accomplished this feat across just 15 starts. The safe analyst would evaluate him by his overall line: 5.05 FIP, 8% K-BB, 1.44 HR/9, -0.1 fWAR. That’s a bottom 20% starting pitcher line posted by a seventh-string, 12th rounder with poor stuff. That’s, frankly, what we should expect from Evans.
Still, it’s hard to ignore that for nine batters a night, Evans was a good or even great pitcher. We care about this split because it’s a possible clue towards something less measurable, something fundamental. We know a lot of pitching is Stuff, but we’re increasingly aware a lot of pitching is other stuff. Batters gain an advantage the more they see a pitcher in a game, so for a pitcher to perform notably in the early or late parts of an outing, that could say something about those less measurable abilities. And for a pitcher at the extremes — Evans certainly is — perhaps it says something about the nature of those abilities themselves. What might we learn about pitching by studying Logan Evans? What might we learn about humanity?
God I love small samples.
Evans in his rookie season showcased a deep, six-pitch repertoire. What he lacked in speed and spin, he made up for in sheer quantity. He could make the ball go in every conceivable direction at release, and batters had a tough time guessing where and when to swing.
We can see that, especially to lefties, Evans mixed his repertoire evenly and unpredictably. Batters had to respect that any one of six pitches might show up, preventing them from teeing off on something specific.
That approach worked on the first time through the order, and most of his pitches were effective against either handedness. But all his pitches got measurably worse across the board once the lineup turned over.
I’m not sure why this was the case. I appreciate that certain skills might be more or less resistant to the times through the order penalty, but to go from so good to so bad is hard to wrap my head around. Perhaps this says something about the impact of movement spread, as coined by Stephen Sutton-Brown for Baseball Prospectus, or the idea that having lots of pitches moving in all directions can keep hitters off balance. Maybe that alone is enough to get through a lineup once, and then raw stuff is necessary from there? Or maybe Evans struggled to disguise (or tunnel) his pitches, as Timothy Jackson recently pointed out for Baseball Prospectus; once they could identify each of his pitches, the jig was up.
Evans enters Spring Training 2026 as depth. His exact proximity to the starting rotation is unclear, whether he’ll continue to serve as second alternate or if he’ll leapfrog Emerson Hancock’s fourth attempt. We only know that opportunity relies on something going wrong, and that something will eventually go wrong. The Mariners are coming off a season where four starting pitchers missed time with some type of injury; one of them still has bone spurs. Evans will pitch in MLB at some point this year.
I’m fascinated to see what if any changes he makes. The Mariners know all that I’ve written here. They’ve seen his splits, they’ve measured his arsenal, and they’ve surely set forth a Plan. Maybe we’ll see him add a pitch, or remove a pitch, or overhaul a pitch, or shift his aim, or adjust his sequencing — something in an attempt to stump batters just a bit longer. It’s worth following for the sake of Evans’ career and the Mariners’ success, but it could also provide a glimpse into the minds of one of the sharper collections of pitching thinkers out there. This is a challenge that justifies our modern Pitching Bureaucracy. This is where organization reputations are earned.