Robert Gasser's Stuff Has Improved Enough. Now He Has to Hit Some Spots.

Robert Gasser was a two-fastball guy last year, who was really more like two different one-fastball guys. He leaned heavily on his four-seamer against right-handed batters, and on his sinker—really, a running two-seamer—against lefties. He only made two starts in the majors, but that's what he showed in them, and it roughly matched what he had shown in his rookie season of 2024, before going down with an elbow injury. He comes at you from a low slot, but he doesn't have anything with much depth. Instead, he's working east and west at all times, and his project within each at-bat is to set up and execute a sweeper to get you out.

This season, much of that has changed. Gasser's slot is even lower in 2026 than it was in 2025. He's also using more of a crossfire delivery. In this pair of images, you can clearly see the lower arm angle, though the slight difference in camera angles makes it harder to tell that he's striding closed as he comes down the mound.

Those adaptations give Gasser a clearer path to being a useful left-handed reliever, but interestingly, the changes he's made to his arsenal push in the opposite direction. He's now something much closer to a true three-fastball guy, who not only has a cutter he trusts again, but throws the four-seamer, the sinker, and the cutter to both lefties and righties.

Ah, yes, and about that sinker: it's not a two-seamer that runs but doesn't sink much, anymore. Gasser acknowledged after his first big-league start of the year that he's made a grip change this year. He now throws what he calls a "one-seam" sinker, with more depth. 

For those unfamiliar with the concept, a one-seam grip places one of a ball's horseshoe-shaped laces between the fingers of a pitcher, letting one seam catch the air and create downward movement via air resistance, rather than spin direction or traditional seam-shifted wake. 

It's an unusual grip for a pitcher coming from a low slot like Gasser's, but the effect has been to give his sinker much more true sink. Despite the lower slot, Gasser's four-seamer has as much rising action as ever this year, but induced vertical break on the sinker is 6.8 inches, down from 9.6 inches in 2025.

Unequivocally, this is a nastier pitch, and mixing it with the good changeup and sweeper Gasser has long had plus the two other fastball shapes should allow him to miss bats and collect weak contact, if the rest of the pieces fall into place. What are the rest of the pieces? In a word: location.

Gasser has walked nine of the 87 batters he's faced this season, which is alarming, because control isn't even his biggest problem. Rather, it's that he's also allowed 11 extra-base hits. A handful of those came in Las Vegas, where the conditions weren't conducive to success for any pitcher, but he's been hit hard in each of his appearances so far. He's just making too many mistakes in the heart of the zone to dismiss any of the damage being done against him as a matter of bad luck. Though the tweaks to his sinker have given him a chance to hit better spots with it low in the zone, in practice, he's leaving it up too much—be that in the zone, when it was meant to be below it, or up up.

Living mostly in the 91-93 MPH zone, Gasser doesn't have the margin for error to miss as much as he's been missing, with any of his pitches. He's built a more interesting arsenal than he had in the past, thanks in part to being healthy enough to get the reps in and do so. These were needed changes. To lock them in and enjoy the fruits of them, though, Gasser will have to keep drilling on the mechanics involved. He'll have to succeed at hitting his targets, because the stuff is now good enough to win—but it will never be good enough to make up for missing in the middle of the dish to big-leaguers.