Mitchell Boggs’ transition to the bullpen is going ok so far (granted I have a bias towards hard throwing relievers in general). His ERA is down a good deal from last year, but his FIP is only marginally lower. We’d expect more from a pitcher making the bullpen transition; however it is still early and the sample sizes are small. We can say that he is definitely throwing much harder as a reliever.
Here’s a breakdown of how Boggs’ transition has impacted his velocity, and also how velocity impacts his results. Only fastballs (all types) are included. The left hand axis has frequency of the velocities and the right hand axis has wOBAc for the respective velocities.
And here’s how it impacts his whiff rate, with both frequency and whiff rate on the left axis