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Splitting Hairs on Felix Hernandez Season Splits

Splits like first half and second half, not splits like Mary Lou Retton.

Joe Nicholson-USA TODAY Sports

Felix Hernandez needs no introduction. If I introduced him to you, you would probably pee your pants. That's how no-introduction he is.

Introduction notwithstanding, the man they call The King had his most ineffective season last year since about 2008 when he wasn't just running roughshod over opponents like he was Samwell Tarly playing Red Rover with Kindergartners. But when 18 wins, a 8.52 K/9, and 3.53 ERA represents a disappointment, well you're doing alright. Or as Deion Sanders might tell Doug Baldwin, aight.

You may or may not have the same short-term memory issues that I have, but it doesn't take a deep dive in his stats to recall that Felix was having a particularly fine season through the "first half" (quotations denote arbitrariness of what they call the first half, which isn't a half at all. I digress) -- and on the whole, it was entirely King-like.

Over the first half, he threw 117.1 innings, giving up just 90 hits, 37 earned runs, while striking out 112 opposing batters, good for a 24.1% strikeout rate. He owned a 2.84 ERA (3.33 FIP), and his rate of allowing home runs sat at a stingy enough .77 HR/9. To that point, opponents slashed .211/.279/.323 with a .263 BABIP and just a .268 wOBA. Felix turned basically everyone into Chris Owings.

These results even include getting throttled by the Astros in Houston, giving up eight earned runs in ONE THIRD of an inning. Take that game away from the first half and, well, he's a lot like your college transcript without Physics 101.

His second half? Well, that's what I'm here to talk to you about.

Hernandez threw 84.1 innings, giving up the same number of hits he did over his first 117.1 (90). He gave up more earned runs (42), struck out just 79 batters (21.9% strikeout rate), earning a 4.48 ERA (4.26 FIP) and his HR/9 basically doubled to 1.39. In those 84.1 innings, opponents slashed .270/.329/.456, with a .320 BABIP and .339 wOBA. To be consistent, where everyone in the first half was Chris Owings, everyone in the second was more like Josh Reddick.

My immediate speculation of course is that Felix must have been pitching hurt, and the first place I typically run to is velocity. The results give us nothing, which, I suppose is very good news (data is from Brooks Baseball, and I've omitted their data on his cutter because he threw it about 20 times all year, and I'm not convinced it actually was a cutter at all, but I'll shut up now):

Pitch Type Velo 1st Velo 2nd
Fourseam 92.68 92.99
Sinker 92.09 92.51
Change 88.65 88.78
Slider 84.59 85.28
Curve 80.65 80.93

Now, I'm not physician, or an occupational therapist, or one of many well remunerated professionals -- and maybe it's entirely possible you could pitch hurt and still throw hard. However, Felix was, across the board, throwing harder in the second half in which he struggled to achieve the kind of results we're used to. But, in Yoda speak, dead his arm was not.

The second place I typically run to is release point. Because when it hurts to throw, you do funny things. Punch yourself in your throwing shoulder 100 times and try to throw a baseball. You'll look funny.

Using the data from, I looked at two of his most common pitches, his slider and his change. Each is an overlay of the first and second half release point, so just look for the date if you want your internal voice to say "before" and "after".

Felix change

Felix sinker

If anything, Hernandez does play it pretty fast and loose on his release points, and that might be wrapped up in his position on the pitching rubber -- but looking at these two pitches, he's consistently in the same blob from first half to next. When there's a clear drop in release point, you can usually tell there's at least something going on -- whether it is a new approach or your shoulder feels like it's getting stabbed every time you throw the ball. And for what it's worth, I looked at his fourseam fastball and curve, and there's no appreciable difference there either. But we're going to be .gif heavy today, so let's save some space, eh?

So velocity is good. Release point is good. Did anything change?

Certainly not a smoking gun, but there was a clear point where Hernandez and his brain trust decided to alter his repertoire. Whether that started on 7/19, I don't know -- but it certainly could have been a discussion over the All-Star break. Because the second half repertoire changed in a pretty notable way:

Pitch Type 1st Half
2nd Half
Fourseam 12.34% 15.20%
Sinker 32.30% 23.92%
Change 29.70% 26.23%
Slider 4.90% 7.41%
Curve 20.24% 25.23%

So almost a 10% drop in usage of his sinker, but still a significant pitch -- and a subsequent increase in his curveball, which by way of pitch values is easily his best. Perhaps an investment banker got a hold of him and told him to diversify, I don't know. But this seems intentional, not random.

In looking at his first half results, it's not very hard to understand why they might have made this change:

Pitch Type Count HR BAA SLG ISO BABIP Observation
Fourseam 214 2 0.190 0.354 0.165 0.289 Solid
Sinker 560 6 0.288 0.470 0.182 0.276 Not very good
Change 515 1 0.210 0.254 0.044 0.301 Excellent
Slider 85 1 0.300 0.600 0.300 0.250 oof
Curve 351 0 0.082 0.082 0.000 0.135 Wow

His sinker was getting torched and his curve and change were both getting consistent outs, with the curve making batters look just silly.

So he makes the modification to fewer sinkers and more curves, a few more fourseam fastballs and sliders. What happened?

Pitch Type Count HR BAA SLG ISO BABIP Observation
Fourseam 197 2 0.276 0.448 0.172 0.326 Pretty bad
Sinker 310 5 0.349 0.635 0.286 0.333 Very, very bad
Change 340 5 0.270 0.500 0.230 0.310 Wait, what happened here?
Slider 96 1 0.444 0.667 0.222 0.467 Usher!
Curve 327 0.175 0.225 0.050 0.280 Not as good, but still very good

The curve was still really quite good but his change became a disaster and nothing else was very good either.

Since we're here and we're geeking out on numbers, I find the data on right handed batters versus left handed batters kind of useful as well. Here are splits and results by offering versus left handed batters:

First Half

Pitch Type Count HR BAA SLG ISO BABIP Observation
Fourseam 129 0.163 0.302 0.140 0.269 Very good
Sinker 291 5 0.328 0.627 0.299 0.293 Very horrible
Change 233 1 0.212 0.288 0.076 0.232 Good
Curve 228 0.081 0.081 0.000 0.125 Great
2nd Half
Fourseam 123 0.235 0.353 0.118 0.333 Ok
Sinker 160 2 0.250 0.438 0.188 0.222 Bad, but better
Change 155 4 0.280 0.600 0.320 0.250 Terrible
Curve 193 0.244 0.311 0.067 0.423 Ok, worse than 1st

(He threw his slider very little to LHB).

And then versus right handed batters by split and offering:

1st half

Pitch Type Count BAA SLG ISO BABIP Observations
Fourseam 85 0.222 0.417 0.194 0.316 OK
Sinker 269 0.246 0.308 0.062 0.259 Pretty good
Change 282 0.208 0.222 0.014 0.405 Very very good
Slider 85 0.300 0.600 0.300 0.250 Bad
Curve 123 0.083 0.083 0.000 0.154 Yes, we want this
2nd half
Pitch Type Count BAA SLG ISO BABIP
Fourseam 74 0.333 0.583 0.250 0.316 Horrible horrible
Sinker 150 0.452 0.839 0.387 0.458 Horrible horrible
Change 185 0.260 0.400 0.140 0.387 Not very good at all
Slider 96 0.444 0.667 0.222 0.467 Stop it
Curve 134 0.086 0.114 0.029 0.125 Awesome

There's kind of a common finding here and that's the change-up. In general, his second half offerings weren't very good other than his otherworldly curveball, but the change went from good to bad overnight -- and that's not helpful when you throw it more than a quarter of the time.

Something of note about his change from the first half to the second half was general movement -- in that it was actually moving far more horizontally and far less vertically. And as you see above, the results vs. RHB weren't very good but the results vs. LHB went from pretty darn good to pretty awful. Below are the frequencies, velocity and movement of his change to LHB first half and second half:

Pitch Type Count Freq Velo (mph) pfx HMov (in.) pfx VMov (in.)
1st half CH 233 26.42% 88.43 -6.21 1.32
2nd half CH 155 23.96% 88.42 -7.07 0.76

But movement is good, right? Certainly -- if you know where it's going. As I'm sure you're aware, they say the hardest thing to do in sports is hit a baseball, but just ask Randy Johnson about the nuances of a quarter inch release point -- it's the difference between a strike on the corner and a ball over John Kruk's head (yeah, I know that was for theater). So in the second half of the season, The King's change was moving almost a full inch more horizontally and a half inch less vertically. Which is super, unless you can't hit your spots with it anymore, which is ostensibly to blame here.

It's an imperfect example, but his change reminded me of the game against the Boston Red Sox in which he gave up three home runs -- two of them were clearly on a change-up, one to Pablo Sandoval and another to Jackie Bradley Jr. Against Bradley Jr., you don't see that horizontal movement as much, but the lack of vertical movement leaves it up as a meatball:

bradley HR

This isn't gotcha stuff. This is nuanced. Felix wasn't very good in the second half of 2015, and I'm perfectly willing to accept that it was dumb luck, bad juju, small sample size, what have you. The obvious indicators don't suggest any kind of major arm damage, so yay. But the data certainly suggests there was a demonstrable change in the way  Hernandez chose to approach hitters by way of his repertoire -- and for one reason or another, that led him from an excellent first half to a very mediocre second half. Heading into 2016, I'm certainly willing to bet we see that first half Felix again, and in order for the Mariners to truly contend, Stottlemyre and company will need to figure out how to get that production over 34 starts.

Go M's.