A Perspective of Andrew Chafin

The Diamondbacks signed free agent relief pitcher Andrew Chafin. Let’s look at him.

How good is Chafin’s pitching?

Several high-level statistics show that over his career he pitched consistently well above average. In 2018, Sean Testerman wrote about Chafin’s FIP, WPA, and RE-24. The following table shows those statistics.

His best season for WPA and RE-24 was 2021. One reason for great results in 2021 was that each of his three main pitches (four-seam fastball, sinker, and slider) had low run values per 100 pitches (-3.