Ryan Yarbrough has dramatically slowed his breaking ball

Ryan Yarbrough’s slider, already among the slowest in baseball, is only getting slower.

Check out how Yarbrough’s breaking ball has been operating with the passage of time, where each dot below is an appearance on the season:

The arrow indicates games over time, and the increased horizontal movement with decreasing speed is almost perfectly linear with each successive appearance. The seven dots farthest to the left are all from July and August.

And it should be noted, the change seems isolated to horizontal movement, as vertical movement remains unchanged.