Justus Sheffield

Age 23 SP
  • Born 05/13/1996
  • Bats L
  • Team: Seattle Mariners
2019 Statistics
W-L
0-1
IP
36
ERA
5.50
WHIP
1.72
K
37
K%
22.0
2020 Prediction
Coming Soon
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2018
2019
Changeup
16.8% Thrown 87.7 MPH 31 CSW%
Four-Seamer
47.7% Thrown 92.8 MPH 26.5 CSW%
Slider
35.5% Thrown 84.2 MPH 33.5 CSW%

Sheffield’s changeup averaged 87.7 mph and returned a pretty decent 15.2% swinging K rate (34% whiffs). It shows an above-average drop and induced a very respectable 37.8% chase rate. Look for Sheffield to continue to refine his control of the changeup (33.9% zone rate last season) as that 3rd pitch will be key to his viability as a starter.

GIF made by Mark McElroy. Blurb written by Ryan Amore

Sheffield’s fastball averaged just under 93 mph and topped out at 95.5 mph. A 12.8% whiff rate (4.4% swinging K rate) was decidedly underwhelming. Interestingly, his four seamer’s spin rate of 1835 RPM was one of the lowest in baseball (0th percentile).

GIF made by Mark McElroy. Blurb written by Ryan Amore

Sheffield threw his slider just over 35% of the time last year. His primary put away pitch (30.2%), the slider returned an excellent 47.5% whiff rate (23.9% swinging K rate), 40.1% chase rate, and a more modest but still reasonable 34.3% zone rate. He showed the ability to emphasize the slider down and out of the zone that’s what you like to see.

GIF made by Mark McElroy. Blurb written by Ryan Amore
2018
2019
Four-Seamer
53.6% Thrown 94.3 MPH
Slider
35.7% Thrown 84.7 MPH
Changeup
10.7% Thrown 89.9 MPH

Sheffield’s four-seam fastball sits in the mid-90s and maxes out at about 96 mph. It is his main weapon, but needs some work before it is good enough for the majors. Last season he gave up a .333 BA when he threw it.

Sheffield’s slider is his secondary pitch and hitters see it about a third of the time when they face Sheffield. Right now, his slider is his best pitch, being the only one in his repertoire that put up a positive pVal.

Although it was only thrown six times, it is clear that Sheffield needs to work on his changeup. Hitters went 2-for-3 with a home run against it last season.

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