Nate Silver, who is the founder and editor in chief of FiveThirtyEight, wrote today about a new concept that he created. A way to better judge relievers overall ability. Win Probability Added, or WPA, is one metric to use, and Sky Kalkman added in his variation of WPA, but Silver’s metric is easy to use, and more importantly, calculate by hand if you want to*.
We all know saves don’t really tell the value of a reliever. Andrew Miller and Dellin Betances rank first and third in fWAR since 2015, they hold a combined 69 saves, or one more than closer Cody Allen.