Corey Kluber and Kluberization: Ditching the Four-Seam

If Corey Kluber’s road to the big leagues was long and winding, the reason for his recent success might be short and simple. One day, some time in 2011, the pitcher finally gave up on his four-seam fastball and started throwing a two-seamer. And now you have the current Corey Kluber. A contrite pitcher talking about a simple change doesn’t make for a long interview, but the Corey Kluber Process might be applicable to some other young pitchers around the league.

Kluber does have great offspeed stuff. His change-up (22%), slider (20%), and cutter (15%) are all above-average by whiff rates. That’s no small feat. The list of other starting pitchers with three above-average whiff rates on offspeed pitches is very short: Yu Darvish, Matt Harvey, Felix Hernandez, Tim Lincecum, and Jerome Williams. That last name — the last two names these days? — should give you pause. “All of that other stuff plays off the fastball, if you’re not consistent with the fastball, none of that other stuff is going to be as good,” said Kluber before a game against the Athletics this week.

So, despite having a great mix of secondary pitches, Kluber has had to find his way to the big leagues by improving his fastball. “I was getting hit around and was having trouble working consistently down in the zone,” said Kluber of 2011, when he had an ERA over five in Triple-A. Big league pitching coach Mickey Callaway and then-Triple-A pitching coach Ruben Niebla conferenced with the pitcher and advocated the two-seamer. The change has taken to Kluber — “I hardly ever throw the four-seamer any more.”

Now he’s got a sinker that coaxes mostly grounders. Now he’s got three pitches that go for grounders. The fastball is the most-thrown pitch in baseball, and now he has one. (No, he never discussed the idea of throwing his cut fastball as his number one, he said.)

Now the Indians’ right-hander is getting used to the pitch. “It’s a pretty drastic change to throw the ball differently than you’ve thrown it your whole life,” Kluber said, adding that he’s getting more comfortable with it every day despite the change-up being his biggest “feel pitch” that requires as much practice. A little uptick in velocity on the fastball and improved walk rates seem to reflect that he’s good with the two-seamer now.

This transformation, at least in retrospect, seems so easy. Three main fastball grips are there for pitchers to use, and they’ve been fiddling with that pitch the longest in their lives. The fastball is the first thing you’re allowed to throw. It also builds up a sample fairly quickly — are there other Klubers out there? Could some bad fastballs undergo the Corey Kluber Process?

I suppose we’d be looking for a four-seamer with a bad whiff rate on a pitcher that doesn’t already throw many two-seamers. Taking only those starters that threw more than 750 four-seamers last year, and then sorting those for the worst whiff rates, you get 20 pitchers who get fewer than 4.5% swinging strikes on their four-seamer (the average four-seamer in that group got a 6.7% swinging strike rate). Here are those 20, with their number of two-seamers listed in the last column.

Pitcher Four-Seamers 4-seam swSTR Two-Seamers
Jason Vargas 857 0.026 467
Scott Diamond 1411 0.027 #N/A
Jhoulys Chacin 1016 0.030 758
Ryan Dempster 1180 0.035 219
Esmil Rogers 923 0.037 438
Jarrod Parker 757 0.037 1141
Yovani Gallardo 885 0.037 594
Mark Buehrle 1004 0.038 634
Hyun-Jin Ryu 959 0.039 683
Jeremy Hellickson 952 0.039 600
Tyson Ross 1018 0.039 164
Justin Grimm 861 0.040 113
Dylan Axelrod 772 0.042 289
Tommy Milone 1200 0.043 229
Edwin Jackson 1554 0.043 341
Ivan Nova 772 0.043 489
Paul Clemens 782 0.044 6
Joe Blanton 753 0.044 #N/A
Jeremy Guthrie 1196 0.044 #N/A
Tom Koehler 1044 0.045 221

I don’t know that Joe Blanton and Jeremy Guthrie would really be in the same class as a young Kluber. They’ve probably made their bed by now.

Even among the younger names, though, it’s hard to spot someone with the offspeed resume that Kluber had when he made the change to his fastball grip. Scott Diamond has actually been throwing more two-seamers lately by Brooks Baseball (the numbers above are from our PITCHF/x database) and they are getting 63% ground balls. Though he only has the plus curve otherwise, it could make him more valuable than he was in the past. Considering how good Tyson Ross‘ slider is, and the fact that his 200 or so two-seamers got a 73% ground-ball rate, and that his four-seam didn’t get the whiffs you’d like, maybe more sinkers would serve him well (despite the platoon splits).

Justin Grimm has a good curve, slider and a change-up he can use for grounders. His four-seam didn’t get whiffs or grounders last year, and his two-seam got 63% grounders. By Brooks Baseball, Paul Clemens didn’t throw a two-seamer despite a bad four-seamer and a good change and curve — with his poor ground-ball rate, he might be a prime candidate for Kluberization. Tom Koehler gets good whiffs on a change and slider combo, but his four-seam ended up on this list. These might be your best Klubers, looking for a way to make it in the big leagues despite a bad four-seamer.

Try the two-seamer. It just might save your career.

With a phone full of pictures of pitchers' fingers, strange beers, and his two toddler sons, Eno Sarris can be found at the ballpark or a brewery most days. Read him here, writing about the A's or Giants at The Athletic, or about beer at October. Follow him on Twitter @enosarris if you can handle the sandwiches and inanity.

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8 years ago

didn’t help him much on wednesday.

8 years ago
Reply to  rob

I just knew that was going to be the first response. So clever!

Free Bryan LaHair
8 years ago
Reply to  Fanthed

i just knew this was going to be the second response. how clever!

Garrett's Mom
8 years ago

I just knew this was going to be the third response. How clever!