Strike gold: Best put-away pitches in MLB

Giles' slider was best strikeout pitch in baseball in 2016

January 23rd, 2017

Who had the most dominant pitch of 2016? It's not the same thing as who had the best pitch or the most effective pitch, because those are very different questions. After two years of Statcast™, we know that pitchers do exert a certain amount of control over the type of contact they allow, and a pitcher who can prevent exit velocity can be effective even if he's not missing bats. ( 's curveball allowed the lowest pitch-specific exit velocity, at 81.4 mph, for example.) If you can miss bats and limit hard contact, then you're a star.
That's not the question we're asking, though. What we're interested in simply the purest outcome of the pitcher/hitter battle, which is when the hitter tries to make contact and fails. Yes, called strikes are good. Yes, poor contact is good. But there's nothing quite like a hitter swinging-and-missing entirely, is there? So which pitches collected the highest whiff rates (swinging strikes per swings), among those with at least 100 pitches thrown? You'll see some familiar names here, but others may surprise you.
58.3 percent whiff rate --
52.9 -- Danny Farquhar
48.3 --
47.1 --
46.6 -- A.J. Ramos
Maybe you're surprised that we're starting with the changeup, when traditionally the fastball ought to lead these lists. We're doing it because Rivero's change might have been the most unhittable pitch in the game last year -- and it's a big part of why the mostly-disliked trade that sent him to Pittsburgh along with Taylor Hearn for may end up being a steal for the Pirates.

Rivero's huge whiff rate on his change didn't just lead the game in 2016, by the way. It was the fourth-highest changeup whiff rate in recorded history, which goes back to 2008, comprising more than 1,000 pitcher seasons. He's also one of just three lefties to hit 100 mph in 2016, which no doubt plays into the success of the change as well. Don't worry, Bucs fans. This will end well for you.
Gif: Rivero strikes out Segedin with a changeup
Four-seam fastball
37.2 percent whiff rate -- Nick Vincent
34.6 -- Rich Hill
34.1 --
34.0 --
33.3 --
Four of these names make a tremendous amount of sense. Of course Chapman and his historic velocity are going to collect whiffs. Of course Hill and his high-spin fastball that works in conjunction with his high-spin curveball would be on this list, and the same goes for Edwards. Familia has become one of the more dominant relievers in the game. This all makes sense. 
But none of them have the whiff rate of Vincent, who has quietly been a strong reliever in five years for the Padres and Mariners, striking out 226 against only 54 walks. Last year, that fastball allowed just a .194 average against, despite the fact he averaged just 90 mph. So why wasn't Vincent more successful? Because his slider wasn't nearly as effective, and it's tough to be a one-pitch righty without elite velocity.
36.8 percent whiff rate -- Zach Britton
29.9 --
26.1 -- Jeurys Familia
25.8 -- Josh Osich
25.6 -- Vince Velasquez
Britton's sinker may be the single best pitch in baseball, because not only did he generate the second-highest ground-ball rate of any sinker (behind only Kansas City's ), he had by far the highest whiff rate on the pitch as well. As we further incorporate the quality of exit velocity allowed into pitch rankings, it's very possible that Britton's combination of whiffs, low exit velocity and grounder-friendly launch angles make this baseball's greatest pitch. Even without all that, it's still the most difficult sinker to make contact with.
45.1 percent whiff rate --
43.3 -- Alex Colome
39.9 --
37.4 --
35.8 -- Alex Wilson
It's OK if you don't know Romero, because part of the fun here is finding pitchers with quietly good skills. Last year, he had a 5.91 ERA with Tampa Bay, in large part because of huge trouble throwing strikes, as he walked 28 in 45 2/3 innings. But Romero averages 96.7 mph on his four-seamer, and he has the cutter that hitters can't touch when they swing. So considering he's only turning 26 this year, you understand why the Rays stick with him. There's raw, untapped talent here.
It's worth noting that the Rays have the top two names here, as the underrated Colome comes in second, and the flamethrowing Paxton is close behind in third, which is part of the reason we named him one of 2017's breakout pitchers. (Kenley Jansen and his famous cutter, by the way, came in ninth.)
62.2 percent whiff rate -- 
60.4 -- Luke Gregerson
57.1 -- 
56.2 -- 
55.7 -- 

Most impressions of Giles are colored by the fact that after requiring a huge price to extract him from Philadelphia, he then allowed 10 earned runs with a 9.00 ERA in April. That being the case, it was easy to miss just how great he was after that, whiffing 88 in 55 2/3 innings from May 1 on, allowing four homers in the final five months after allowing four homers just in April. While Giles throws hard, his fastball (.378/.456/.622 against) was crushed, but his slider (.093/.140/.186 and huge whiff rates) was elite.
You'll notice Giles' Houston teammate Gregerson here as well, but it's Diaz who should stand out. His overall strikeout percentage of 40.6 in his rookie season matched Chapman's, and it's not all because of fastball velocity. It's because Gregerson's slider is a truly elite swing-and-miss pitch.
56.6 percent whiff rate --
52.8 --
52.7 --
52.2 --
50.0 --
Kimbrel's deadly curve has been a huge weapon of his for years, and while it does have good movement, a non-unrelated fact is that he also leads the curveball list in velocity, as his comes in at an average of 87.3 mph. Second on that list is Vizcaino, at 85.8 mph. Who, you're asking, is Godley? Part of Arizona's return for from the Cubs, four of his five pitches were absolutely crushed in 2016. The fifth, however, was that curve, which allowed a mere .186/.231/.267 line against.