Statcast's most improved pitchers of 2017 – MLB.com

Here are the results:

Average four-seam fastball velocity
Min. 250 thrown in 2016 and ’17
1. Tyler Chatwood, Rockies: +2.1 mph (92.7 to 94.8)
2. Felipe Rivero, Pirates: +1.9 mph (96.5 to 98.4)
3-T. Raisel Iglesias, Reds: +1.7 mph (94.6 to 96.3)
3-T. Chase Anderson, Brewers: +1.7 mph (91.6 to 93.3)
5. Corey Knebel, Brewers: +1.4 mph (95.9 to 97.3)

This section excludes pitchers who moved from the rotation to the bullpen in 2017, as such a shift naturally tends to cause a velocity spike. For example, the D-backs’ Archie Bradley saw his four-seamer jump from 93 mph as a starter in ’16 to 96.3 mph as a reliever this year, when he emerged as a top bullpen piece for Arizona.

Chatwood, who has toiled away in Colorado since 2012, is an intriguing free-agent option this offseason. In his second year back from his second Tommy John surgery, the right-hander bumped his overall average fastball velocity (including two-seamers) from a career-low 92.6 mph to a career-high 94.6 mph. Though he did make eight relief appearances, Chatwood reached as high as 98.1 mph in his 25 starts — his best mark in that role since his 2011 rookie season.

Iglesias was quietly dominant as Cincinnati’s closer, with a 2.49 ERA, a 30.1 percent strikeout rate, a .576 opponent OPS and 28 saves in 30 chances. Factoring in sinkers, his average fastball shot up from 93.2 mph to 96.1 mph, while his opponents’ slugging percentage on those pitches dropped from .358 to .322.

Iglesias K’s Avila for the save

[email protected]: Iglesias strikes out Avila to earn the save

Raisel Iglesias gets Alex Avila to strike out swinging, notching the save as the Reds defeat the Cubs, 4-2

Average four-seam fastball spin rate
Min. 250 thrown in 2016 and ’17
1. Nate Karns, Royals: +181 rpm (2,210 to 2,391)
2.

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