xSLG isnt a stat youll find on the back of a baseball cardor one youd find on a baseball reference page. However, as far as advanced stats go, xSLG is pretty straightforward. It is the expected slugging percentage of a hitter based on hit probability his batted balls in play, regardless of outcome. So if a player has a high xSLG but low SLG, hes probably experienced some bad luck on batted balls. Likewise, if a player has a high SLG but low xSLG hes probably been a little fortunate in the power [...]