Updated through August 13, 2017
xG: Short for expected goals, a metric based on the number, type and location of shot a team has and concedes (i.e. Expected Goals for, Expected Goals Against, Expected Goal Difference).
TSR: Total Shot Ratio, A ratio of shots a team has compared to their opponents.
TSoR: Total Shots on Target Ratio: Same as TSR, but for shots on target instead of all shots.