RotoGraphs · Four-seam IVB tracker

Which four-seams run on ride, and where is it heading?

Every dot is a qualified four-seam starter. The horizontal axis measures how tightly a pitcher's start-by-start IVB correlates with his fastball run value this season (further right means more reliant on ride). The vertical axis tracks how far his IVB has moved across the season. Blue dots are the 20 most IVB-reliant starters.