The Nationals brought in two very different arms at the deadline, and the contrast has been impossible to miss. Yovanny Cruz comes at hitters with triple-digit heat, while Will Dion works at 91 MPH.
On paper, that should tell you everything. In reality, it tells you almost nothing.
Dion’s fastball is the better pitch by a wide margin, and the reason starts with shape. Velocity matters, sure, but it is only part of the equation.
The other piece is how the ball moves, and Dion’s heater has the kind of ride that makes life miserable for hitters. He averages more than 20 inches of induced vertical break, which is elite.
A pitch can’t truly rise, but when it fights gravity that effectively, it looks that way to the batter. Last night, Mets hitters were swinging underneath 90-92 MPH fastballs over and over.
That’s not a fluke. Between the Guardians and the Nationals, Dion has posted a 33.6% whiff rate on his fastball, which is outstanding.
Add in his command, and the pitch plays far above its radar-gun reading. His location heat map on Baseball Savant shows a clear target area at the top of the zone, exactly where a high-riding fastball belongs.
He used that spot well yesterday.
The rest of Dion’s mix helps the fastball even more. His changeup comes out looking like the heater before it fades away, and the 13 MPH gap between the two pitches gives hitters another uncomfortable decision.
He is not overpowering in the traditional sense, but the arsenal works. That is a big reason he has a 3.25 ERA and 33 strikeouts in his first 27.2 big league innings.
Cruz is the opposite kind of case. His raw stuff looks like it should be dominant.
The fastball averages 100 MPH, and his slider and splitter both flash real upside. But the results with the Nationals have been rough, and the fastball is a huge part of the problem.
He has not gotten a single whiff on the pitch at the major league level. Cruz has thrown 51 fastballs, many of them in triple digits, and hitters have not missed one.
Command is part of that issue. His location heat map is scattered, with pitches up, out, and down.
He simply does not know where the ball is going often enough.
The movement profile is just as troubling. Dion’s fastball has 20.1 inches of rise and 0.7 inches of tail.
Cruz’s heater sits at 12.7 inches of rise and 12.8 inches of tail. That is the kind of dead-zone fastball hitters can sit on, because it ends up right where they expect it.
In 2026, just throwing 100 is not enough if the pitch doesn’t move in a way that creates doubt.
Cruz’s final stretch last night said plenty. He went to 13 straight sliders to finish the game, which showed how much faith he had lost in the fastball. The slider is the better pitch right now, but once hitters can ignore the heater entirely, they can still do damage.
The fix, at least in this view, is to move away from the four-seamer. A trip to the minors could help him build comfort with either a sinker or a cutter.
A sinker, in particular, makes sense because of the natural tail already on his four-seamer. That would give him a way to chase ground balls while leaning on the slider and splitter to finish hitters.
Even with only average command, that would be a more usable package.
At the moment, though, Cruz doesn’t have that kind of functional arsenal. He doesn’t trust the fastball, and that uncertainty is bleeding into everything else. For a pitcher who has probably survived on velocity for much of his career, that approach is not getting the job done now.
That is the lesson in these two deadline additions. In a game obsessed with velocity, Will Dion and Yovanny Cruz are a sharp reminder that speed alone doesn’t define a fastball.
Shape and command matter just as much. That is why Dion’s 91 MPH heater gets whiffs a third of the time, while Cruz’s triple-digit fastball gets none.
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