If you asked me what the highlight of Tuesday’s 15-1 drubbing of the Royals was, I’d pick Cam Schlittler’s casual six-inning, one-run start. But a close second would be Amed Rosario’s four-hit, two-homer performance. Ok, it’s important to note that his second homer came against a position player on the mound, poor old Tyler Tolbert. However, there was nothing flukey about the rest of his performance; he was scalding balls all day, with all of his hits having exit velocities exceeding 100 mph. Seriously, just look at all this hard contact:
At first, I thought this was just another entry in the annals of “random backup infielder has great game offensively”. (You will always hold a place in my heart, Jayson Nix on April 7, 2013 against Justin Verlander.) But then I looked at Rosario’s FanGraphs page and did a double take – the man’s running a 130 wRC+!
Granted, it’s only been 31 games and 97 plate appearances, which is far from a representative sample size. Rosario has had 31-game stretches where he was even hotter in the past. If I had to choose between “Amed Rosario is a middle-of-the-order bat now” and “this is just a hot streak”, I’m choosing the latter every time.
However, there’s one crucial detail that gives me pause; the shape of his production is totally new. Rosario’s .261 ISO this year represents not only a career high for him, it’s the highest mark he’s run over any 31-game stretch in his career, ever. That seems to me like it’s a sign that something has changed with him.
There’s also the matter of his platoon splits. Rosario owns a career 121 wRC+ against southpaws and a 84 wRC+ against righties. So, surely his hot hitting so far this year is because he’s being shielded against same-handed pitching, right?
Not really, as it turns out. Of Rosario’s 97 plate appearances this year, 52 have come against lefties and 45 against righties – basically an even split. Of course, since lefties only make up less than a third of MLB pitching, having only 50% of your plate appearances come against righties means that you’re being platooned. However, the fact remains that about half of Rosario’s PAs have come against righties this year. His wRC+ against them? It’s the exact same as his line against left-handers – 130. Uh, I thought he was supposed to be a platoon bat?
This level of performance against righties is unprecedented for Rosario. Unfortunately, FanGraphs’ Player Graphs function doesn’t support L/R splits for wRC+, but for our purposes wOBA works just fine. See if you can spot the year that is unlike all the others in this graph:
So, Rosario is hitting for more power than ever, and he’s hitting righties better than ever. How is he doing it?
The first question is easier to answer: Rosario is swinging the bat harder than ever. That seems to have something to do with his power surge, doesn’t it? Case in point: StatCast’s bat tracking metrics go back to 2023. That year, Rosario’s fast swing rate – defined as the percentage of swings at 75 mph or faster – was 15.2%. In 2024, it was 16.7%. In 2025, it was 29.9%, which was already a pretty big increase.
This year, it’s 44.0%.
Over the course of four seasons, Rosario’s gone from swinging hard about as often as Luis Rengifo to Bryce Harper. I guess that’ll help you hit the ball harder. But what about his disappeared platoon splits? Does swinging faster more often automatically make you a more well-rounded batter? I, uh, have some doubts about that.
Ultimately, I can’t point to a clear-cut reason as to why Rosario is suddenly hitting righties as well as he hits lefties this year. I do, however, have a theory. After many hours of grueling research (read: I floated this topic on the PSA slack and Peter gave me this link), I happened upon this tweet from Driveline Baseball:
Don’t be fooled by the formatting of the twee. The most revealing video, at least in my mind, isn’t the big one on the left but the bottom right one, showing Rosario’s 2025 (blue) and 2026 (red) swing trajectories from various angles. In particular, pay close attention to the bird’s-eye view graphic. Notice how Rosario’s 2026 bat path starts off at a markedly lesser angle than its 2025 counterpart, and remains close to parallel to the front of home plate throughout its voyage through the strike zone? My theory is that this revamped bat path has allowed Rosario to perform well against pitches from right-handers which break away from him, alleviating his platoon splits.
It has been found by past baseball research that pitches that break away from same-handed hitters result in the largest platoon splits. It seems that righty pitchers have taken this to heart when facing Rosario; they’ve fed him more and more breaking balls in recent years, with more gloveside horizontal movement.
How do you combat this? Well, one way, it seems to me, might be to “flatten” your bat path as Rosario is doing in 2026 – trying to keep the barrel of the bat as parallel to the front of home plate as long as possible. This would increase your chances of making better contact with, say, sliders spinning away from you, especially if you’re able to catch them out in front of the plate. Lo and behold: it’s still an extremely small sample size, but Rosario’s xwOBACON against breaking pitches from right-handers is by far the highest of his career.
Can Rosario sustain this level of performance going forward? I can’t say for certain. But it’s at least very encouraging that there seems to be real, tangible changes in his approach that are fueling his early-season performance. Keep an eye out for Amed Rosario – he might be playing a bigger role in this Yankees lineup in the coming weeks.