Kyle Harrison's performance analysis highlights a concerning decline in fastball velocity, crucial for MLB success. With an excessive reliance on his four-seam fastball (58% usage), which has not proven effective, Harrison's average velocity has dropped from 93.6 MPH in his rookie season to 92.5 MPH. This decline correlates with changes in spin-rate, affecting the pitch's action. Despite slightly deceptive delivery, the increasing wear-and-tear on his performance becomes more evident, reflecting the challenges faced by pitchers as they transition into the league.
No Major League Baseball starter relies on their four-seam fastball as much as Kyle Harrison, with a high usage rate but insufficient effectiveness.
Harrison's pitch velocity dropped from 93.6 MPH in his rookie season to 92.5 MPH, indicating a significant decline in his fastball effectiveness.
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