José Alvarado’s Over-the-Top Sinker

Today’s Penning Bull is about José Alvarado, the new pride and joy of pitching Twitter, and about his dastardly sinker—what it is, and what it isn’t, and what does and doesn’t make it uniquely dominant. Here’s a teaser.

Alas, batters are rarely fooled by sinker movement, which is why they have a considerably higher league-wide contact rate against the pitch than against any other.

Contact Rate on Swings, By Pitch, MLB, 2019 (%)

Sinker – 84.6

Fastball – 78.1

Cutter – 75.2

Curveball – 68.2

Changeup – 68.1

Slider – 63.0

Splitter – 62.5

It’s also why the league is throwing fewer sinkers every year—why, indeed, it’s becoming a specialty pitch for a handful of relievers and a rare secondary option for most others who throw it. The sinker just isn’t as nasty as it seems, motion trails be damned. Besides, Alvarado’s movement doesn’t set him apart from the pack. Here are the 10 hurlers whose sinkers move to the arm side least, so far this season, of 89 qualifying pitchers:

Average Sinker Movement, Glove Side, MLB, 2019, Min. 50 Thrown (in.)

Mike Leake: -6.0

Brad Keller: -6.4

Dereck Rodriguez: -6.6

Marcus Stroman: -6.6

Joe Biagini: -6.6

Sonny Gray: -6.7

Jameson Taillon: -6.8

Kyle Hendricks: -7.0

Lance Lynn: -7.1

José Alvarado: -7.3

It’s important to note that being at either extreme, where movement is concerned, is usually preferable to being average. The fact that Alvarado’s sinker moves less to the arm side than those of most hurlers doesn’t necessarily speak badly of it; we might do better to think about these guys’ movement as having an unusual amount of cut, for a sinker, rather than as lacking tailing action.

Where vertical movement is concerned, Alvarado also isn’t an outlier, though again, he’s close to one end of the spectrum.

Average Sinker Movement, Vertical Rise, MLB, 2019, Min. 50 Thrown (in.)

Jake Odorizzi: 9.8

Nate Jones: 8.9

Joe Biagini: 8.6

José Quintana: 8.0

Tanner Roark: 7.9

Dereck Rodríguez: 7.9

Marco Gonzales: 7.9

Fernando Rodney: 7.7

Mike Fiers: 7.5

José Alvarado: 7.4

Again, when we think of exceptional sinker movement, we tend to think of the greatest possible downward movement. That’s not how it works in all cases, though, and Alvarado’s rise might work in his favor. As with the lateral movement, the vital takeaway is that he’s not shredding opponents by making the ball take off in any particular direction, in a way other pitchers don’t.

That leaves us with the question of what is unique about Alvarado, though, and there turns out to be plenty.

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