J.A. Happ’s (Newest) Fastball Secret
FanGraphsNobody in baseball has as much of a difference in vertical movement between his four-seam and two-seam fastballs.
Published: Sep 20, 2016, 9:13 am Added: Sep 20, 2016, 9:21 am
Nobody in baseball has as much of a difference in vertical movement between his four-seam and two-seam fastballs.