xSLG
Expected slugging — what SLG should be from quality of contact.
What xSLG means
Statcast model that converts EV/LA into expected total bases per AB. Same idea as xBA, weighted for power.
What counts as a good xSLG
Higher is better — roughly .380 is poor, .420 average, .470 good, and .520 or better elite.
Also written
expected_slg · xslg_value
Source
Statcast