When the Reds fired pitching coach Mack Jenkins on April 18, they brought in Danny Darwin from Double-A Pensacola to take over the job. One of his goals for the team’s pitching staff: get them to throw inside with more regularity.

“We’re going to pitch inside. That’s one thing that needs to happen here, try to get part of the plate.”

Tyler Mahle, who thrived under Darwin’s tutelage in the minor leagues, has certainly adopted that philosophy. With a plus fastball but merely average secondary offerings, it’s a mantra he needs to have. Hitters already know they’re getting the heater most of the time, and pounding them inside is the best way to limit hard contact and establish his changeup and slider.

In Mahle’s first start with Darwin as his pitching coach once again, he threw six no-hit innings against the Braves and set a career-high with 11 strikeouts. The pitch mix wasn’t much different than usual — he threw 68 four-seam fastballs among his 97 total pitches — but the way he deployed it varied a bit from his previous outings. With the way his fastball tails to the right, establishing the inside part of the plate is particularly important against left-handed hitters.

Mahle did that quite a bit in his first four starts, but he really emphasized it last Tuesday. The trend continued into Sunday versus the Twins, and the results were again impressive: 6 1/3 innings, one run, four hits, two walks, and seven strikeouts.

On the left is his fastball heat map vs. lefties through his first four outings, and on the right is the heat map from his most recent two:

Clearly, he threw inside quite a bit to begin with. But it’s been a primary focus over the last two starts, and it yielded fantastic results for Mahle.

In the no-hit bid, eight of his 11 strikeouts came on the fastball, and six of them came against left-handed batters. Five of those six started out of the strike zone and tailed back over the plate. Four were called strike threes.

Here’s a look at one of those Ks against Braves center fielder Ender Inciarte:

A similar trend took hold on Sunday in Minnesota, with six of Mahle’s seven strikeouts coming on the four-seamer and three of them clipping the glove-side corner of the plate for strike three — two against lefties and one against a righty.

Because of the way his fastball tails, Mahle hasn’t come in on right-handers quite as much, instead focusing on clipping the outside corner. But he has thrown inside a bit more, primarily up and in, since reuniting with Darwin.

The most important takeaway from these graphics, of course, is Mahle isn’t missing his spots over the middle so much.

Why is this so important for someone who primarily throws fastballs? Since Mahle’s changeup and slider aren’t plus pitches right now, his fastball command has to be pinpoint, particularly because he’s throwing it as a strikeout pitch in most cases over his off-speed offerings. When he’s left it out over the middle of the plate, he’s been burned; four of the seven home runs he’s allowed this year have come on the heater. By pounding hitters inside, he can saw them off and reduce their ability to make hard contact.

Here’s a look at his average exit velocity allowed by zone with the fastball (vs. lefties on the left, vs. righties on the right):

The effectiveness of throwing the fastball inside is clear. The more Mahle can paint the corner, the weaker contact hitters will make. This also allows Mahle to beat hitters on the outside corner, as they can’t lean out over the plate and cover those pitches on the outside edge without the risk of being plunked.

Take a look at some of his strikeouts on Sunday, particularly against Brian Dozier. Mahle beat Dozier on the inside part of the plate in his first two at-bats before blowing a 95-mph heater by him on the outside corner in his third plate appearance.

By pitching inside and locating his fastball with such precision, Mahle’s other pitches also play up. For example, in last Tuesday’s no-hit bid, his slider got six swings and misses, doubling his previous career-high on the pitch in any game. Those whiffs came on only 20 sliders thrown, the third-fewest he’s thrown in any big-league outing.

Mahle will need to develop improved off-speed pitches as time moves along. He certainly doesn’t have the raw stuff of a Robert Stephenson, Brandon Finnegan, or Cody Reed. But the one advantage he has over them — fastball command — is the foundation for any successful pitcher. Now that he’s starting to locate it with regularity, he’s finding more success and should hopefully see improved confidence in his slider and changeup.

The early returns are promising. He’s not only throwing his changeup far more than he did in four 2017 starts, but his whiff rate on all three of his offerings has increased (and his fastball whiff rate ranks 16th among 77 pitchers who’ve thrown the pitch 150+ times). If those secondary pitches continue come along — or one can turn from average to above average — he’s going to be even more fun to watch every five days.

Growing up just north of Cincinnati, Matt has been a Reds fan for as long as he can remember. As a kid, he was often found leading the Reds to 162-0 seasons in MVP Baseball 2005 and imitating his favorite players (Ken Griffey Jr., Adam Dunn, Sean Casey, and Austin Kearns) in the backyard. One of his earliest baseball memories is attending the final night game at Cinergy Field. Matt is also a graduate of The Ohio State University and currently lives in the Dayton area. Follow him on Twitter at @_MattWilkes.

Join the conversation! 10 Comments

  1. EXCELLENT work! I’d be very curious to see these sorts of detailed analysis throughout the season on different pitchers.

    I just hope Darwin doesn’t adopt a one size fits all approach as not everyone has Mahle’s command…..especially BobSteve/Homer/Reed. I’ve been keeping track and ~80% of the home runs allowed by the Reds come on fastballs. I think the Reds are behind the times when it comes to pitch sequencing. A lot of what I’m seeing is that as soon as runners get on base, it’s soft soft soft.

  2. The K of the Twins Grossman on Sunday was beautiful. It also showed that Mahle is learning how to set up ML hitters. Chris Welsh was overjoyed in the broadcast on TV. He loved the way how Mahle got Grossman to flinch on a strike after throwing the prior pitch up and in. After Grossman K’d, he just walked back to the dugout shaking his head. A couple of innings later FSO did a replay of the pitch sequence of that AB. A mature pitcher at 23 is a good thing for the Reds.
    I just don’t know how the Reds will go back and get that extra year of service time now on Mahle. They will need about 5-6 weeks time to send Mahle down, but he hasn’t actually earned a demotion. That may never come now.

    • Yeah, I thought they would find a window this year. I mean, “he’s bound to struggle” I thought… Maybe not.

      • He may not struggle but remember, today is May 1st and there is a lot of season left to play. Remember Amir Garrett last year? Lights out, then awful. Different situation here and it seems likely that Garrett came back from AAA with some sort of injury that he didn’t reveal, but it seems likely to me that at some point Mahle will struggle and if the Reds want to save that service time, they will have a reason to send him down for a spell.

  3. Good stuff, Matt. Intuitively, Mahle seems like the perfect pitcher to best utilize the inside part of the plate, numbers seem to show it is working so far.

  4. Great work here Matt. Kudos!

  5. Great stuff. Mahle is well on his way to locking down a slot in the Reds rotation for the next five or six years at least. If Garrett and Castillo can join Disco in that lineup then the Reds only need two more starters to develop from a long list of candidates (a fifth starter and a sixth starter for inevitable injuries). That could be a very good rotation. I can dream, right?

  6. Astros pitchers are having lots of success and the first thing they’re told is to utilize breaking balls more often. If you have a decent slider or curve, it should be thrown more than 25% of the time. Fastballs should be around 60% unless of course you only have one other pitch and it stinks.

    Sadly, not many Reds pitchers have a good curver or slider then can regularly command or that has enough bite to fool hitters. I like a good fastball, but it needs to move or be pinpoint command.

    All that said, aside from needing to teach and drill in an above average breaking ball for EVERY Reds pitcher, I do like that Darwin has brought back throwing inside. Especially HIGH and inside to left handed hitters, they can’t handle that and they always bite on it.

    I remember an article on Mario Soto way back in the day. It was about pitching inside (he hit a few batters in his day). I think his quote was something like “Nolan Ryan throws inside and everyone is fine with it, Joaquin (Andujar) and I throw inside and everyone wants to go to the mound and fight”

  7. Mahle looks good.

    Castillo’ s mechanics and arm slot are the issue . Why? Perhaps he has some shoulder or elbow fatigue or other issue that’s making him adjust and change, perhaps even unconsciously… They need to put him on the DL…. listen to what you see. Castillo will say he’s fine. Be proactive.

    Go to arizona and start a throwing program with trainers working with his back.core.legs and arm/ shoulder every day. Throw long toss and a few bullpens for a week…..then give him a rehab start or 2 and bring him back up in 3 weeks.

    Too.much riding on this kids arm.

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About Matt Wilkes

Growing up just north of Cincinnati, Matt has been a Reds fan for as long as he can remember. As a kid, he was often found leading the Reds to 162-0 seasons in MVP Baseball 2005 and imitating his favorite players (Ken Griffey Jr., Adam Dunn, Sean Casey, and Austin Kearns) in the backyard. One of his earliest baseball memories is attending the final night game at Cinergy Field. Matt is also a graduate of The Ohio State University and currently lives in the Dayton area. Follow him on Twitter at @_MattWilkes.

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