This chart tracks ninety of the top pitchers (with a four-seam fastball, so no sinker-reliant Cristopher Sánchez ), and the average velocity on their four-seam fastball per month. Hovering on the dot will show the average velocity for that month as well as the whole picture from March and April to July. So this piece will look at some names in the risers in four-seam velocity, and the follow-up will be looking into the fallers. He has struggled with command, issuing walks, especially as he has picked up some fastball velocity. The growth is exaggerated by a 92 mph average outing at the beginning of April, which brings his first month down, obviously.