Jairo Diaz

Age 29 RP
  • Born 05/27/1991
  • Bats R
  • Team: Colorado Rockies
2019 Statistics
W-L
6-4
IP
57.2
ERA
4.53
WHIP
1.30
K
63
K%
25.6
2020 Prediction
Coming Soon
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2018
2019
Four-Seamer
55.7% Thrown 97.0 MPH 22.3 CSW%
Slider
44.3% Thrown 88.2 MPH 37.4 CSW%

Diaz has great velocity on his fastball, but struggled with it this year as he allowed eight extra-base hits in 58 at-bats, which resulted in a wOBA against of .379. He’s always been fairly good at containing the fly balls on his fastball (never been over 24%) but this year that number jumped to 32%, a trend he does not want to see continue now that he will be pitching quite a few times at Coors Field.

GIF made by Ryan Amore. Blurb written by Justin Filteau

Diaz’s slider was by far his best pitch, and quite frankly, should be grouped with the top pitches in the league, as it generated a whopping 47% whiff rate along with a .189 BAA and .234 wOBA against. This high whiff rate can be attributed to its vertical movement as he is able to generate 4 inches more than league average. He seems to have worked on generating more drop than lateral movement, as he sacrificed 3 inches of horizontal break from his last season in 2017 in order to gain 7 vertical inches.

GIF made by Ryan Amore. Blurb written by Justin Filteau
2018
2019
Fastball
77.3% Thrown 97.3 MPH
Slider
22.7% Thrown 85.2 MPH

Diaz had average movement on his four-seamer, and could crank it up to 100 mph when he needed to. Considering this, it’s a bit surprising how much contact it gave up, and how much it struggled to produce whiffs. Opponents went 11-for-18 against it in 2017.

The slider had good cut, but below-average drop to it. It was thrown less than 30 times on the year. Every batted ball against the pitch was hit on the ground.

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