Jake Marisnick: A Fly Ball Revolutionary

At the major league level, there has never been anything special about the way Jake Marisnick swings a baseball bat. His career 66 wRC+ coming into the 2017 season is nothing short of bad, but his legs and glove have allowed him to carve out a nice career as defense-first outfielder for the Astros.

Cut to 2017 and Marisnick’s 129 wRC+ through the season’s first 3 months has raised some eyebrows. As we begin to scratch the surface of Jake Marisnick, we see a lot of changes behind an all-encompassing stat like wRC+.

Over 125 PA (55 games) in 2017, Marisnick has a .245/.328/.536 line. A .245 average is higher than I would have expected this year, but it was surely within the realm of possibilities. A .536 slugging percentage gives me great pause though. Considering Marisnick’s career SLG of .338 coming into 2017, this is an immense improvement. With such a large uptick in power, I like to consider physical changes first, so let’s take a look at a few changes in Jake’s batting stance.


J. Marisnick 2015 Pre Swing.png

First, note that this is from 2015. To me, there were no noticeable changes between 2015 and 2016. We see that pre-swing Marisnick is mostly upright, standing neither open nor closed with his hands kind of “floating” out in front of his chest. Here is a clearer image (from 2016) of his hands “floating” before they get pulled into the load.

J. Marisnick 2015 "Floating" Hands.gif

While this is a habit of comfort and not definitively an issue, it seems to force a load with over-involved hands and arms.

These days Marisnick sets up like this:


J. Marisnick 2017 Pre Swing

Marisnick’s pre-swing stance is now clearly open and less upright, and his hands are no longer floating but steady and drawn slightly back. The earlier engagement of the hands is most obvious when you note the change in position of Marisnick’s elbows between pictures.

Speaking of elbows, check out Marisnick’s back elbow in 2015 and in 2017.


J. Marisnick 2015 Back Elbow.png


J. Marisnick 2017 Back Elbow.png

Once his front foot touches down, Marisnick in 2015 has a high back elbow which straightens out his bat and perhaps lengthens the path of his swing. Marisnick in 2017 has a more angled bat as a result of a lower elbow, which creates a more direct path to contact.

Marisnick appears to have made attempts to see the ball better (open batting stance) and trim motions that lengthen his swing. In turn, these tweaks have helped Marisnick post the best contact rates of his career.

Jake Marisnick Soft% Medium% Hard%
2015 23.4% 52.9% 23.8%
2016 21.1% 52.6% 26.3%
2017 14.9% 52.2% 32.8%
Career 22.3% 52.7% 25.0%

Although Marisnick has always had a “just put it in play” bat, he has consistently hit fly balls too often to maintain a passable average and on-base percentage.

Jake Marisnick LD% GB% FB%
2015 19.7% 41.9% 38.4%
2016 19.3% 45.2% 35.5%
2017 16.9% 36.9% 46.2%
Career 20.5% 41.8% 37.8%

This year he’s hitting even more fly balls. A bump in hard contact is a bit general to support this change though, so let’s look at exit velocity (EV) on just fly balls. We see that in 2016 Marisnick had an 88.5 mph average EV on fly balls whereas this year he is sitting comfortably at 94.1 mph. That 5.6 mph increase was among the biggest jumps from 2016 to 2017, sharing company with the likes of George Springer, Scott Schleber, and Wil Myers. Ultimately, Marisnick has transformed his fly balls from near auto-outs (pre-2017 career: .172/.167/.487) to legitimate weapons (current: .345/.333/.1.276).

This is not a comprehensive analysis, but certainly, this iteration of Jake Marisnick is not one we have seen before. Should we expect his 129 wRC+ to hold up all year? No. Pitchers adjust, and his climbing K% (35.2%) leads me to think his AVG/OBP may tank if the power doesn’t come down to compensate. But I believe regressing to his previous self is equally unlikely. He may just be a fourth-outfielder type, but a Jake Marisnick that can run, field, and at least kind of hit is not a Jake Marisnick I want to play against.


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