RELIEVERS: The White Sox and ERA, xERA and pxERA

This week, we start with a look at how actual ERA and expected ERA (xERA) interact at the halfway point in the season, along with where projected expected ERA (pxERA) fits in. One interesting place to do this is the Chicago White Sox pen:

                    IP    ERA  xERA  pxERA
==============     ====  ====  ====  =====
Belisario          37.0  5.35  3.26  3.47
Guerra             13.7  2.63  3.58  4.56
Putnam             29.0  2.17  3.24  4.01
Petricka           42.7  2.11  3.75  4.24
D.Webb             35.3  3.31  4.97  4.30

The White Sox are having a hard time with their pen, and the focus is all on Ronald Belisario (RHP, CHW) who is the miscast, groundballing, not-enough-strikeouts deposed closer. Belisario has a 5.35 actual ERA,...

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