Dyson’s changeup is his primary offspeed pitch. It’s strictly a chase pitch that he throws in the zone less than 30% of the time. The change was less effective in 2019 with a drop of 6.4% in terms of SwStr% partially due to a drop in O-Swing. The changeup is still a weapon but it’s not as dominant as it has been in the past.
The curveball is Dyson’s least utilized pitch. It acts more like a curve, so let’s call it a slurve. He threw it just 62 times in 2019 but it had an impressive 33% K rate despite a 4.8% SwStr%. I don’t expect the slurve to generate a high strikeout rate without inducing more whiffs.
Dyson averaged 94 mph and dropped the usage of his fastball by nearly eight percent in 2019. The pitch acts like a sinker generating weak ground balls and inducing a low volume of whiffs. It’s an effective pitch early in the count to get ahead of batters.
The two-seam fastball is Dyson’s primary offering. He’s able to throw the pitch for strikes while generating a very high percentage of ground balls. By decreasing the vertical drop, Dyson successfully generated more swings outside the zone and gave up less contact which led to Dyson’s success in 2018.
Dyson’s slider was a successful pitch is 2018 despite a well below-average chase rate and swinging-strike rate. Dyson was fortunate with a very low BABIP against the slider and lost an inch of vertical drop decreasing the ground-ball rate against the pitch. The slider might not be a great pitch but Dyson picks his spots well with this pitch.
Dyson’s changeup was by far his best secondary offering in 2018. The changeup saw more arm-side run and was almost exclusively thrown down in the zone. While Dyson only throws it for strikes 25% of the time, getting hitters to chase it half the time makes it a great strikeout pitch.
Dyson lost over one mph off his four-seam fastball and continues to feature the pitch less and less. With a .389 batting average against and diminished velocity, Dyson would be better off utilizing his two-seamer more often and eliminating this pitch.
The curveball is not one of Dyson’s go-to breaking balls, but still generated a 30.4% strikeout rate against. Despite a decrease in vertical drop, the curve still generated a .136 batting average against, despite a decrease is ground-ball rate.