xG is a statistical model that assigns a probability to each shot based on factors like distance, angle, assist type, and body part. A player with high xG but low actual goals is likely due for positive regression.
For MLS Fantasy, xG helps identify undervalued players (high xG, low goals scored) who are likely to improve, and overvalued players (low xG, high goals) who may regress. It's one of the most useful advanced stats for Fantasy decision-making.