The Ultimate Tiebreaker
In league soccer, when two clubs finish the season with the exact same number of points, a tiebreaker is required to determine their final position. In most major European leagues (such as the English Premier League and the German Bundesliga), the primary tiebreaker is Goal Difference (GD).
Goal Difference is a pure measure of a team's absolute dominance. It rewards teams for continuing to attack and score even when they are already winning 3-0, and it rewards defense for fighting to prevent goals even when losing.
Calculating Goal Difference
The calculation is the simplest in all of sports, yet it dictates championships, Champions League qualifications, and devastating relegations.
The Formula
Goal Difference is calculated by taking the total number of goals your team has scored (Goals For) and subtracting the total number of goals your team has conceded (Goals Against).
Goal Difference = Goals For - Goals Against
The Agüero Moment
The most famous application of Goal Difference occurred on the final day of the 2011/2012 Premier League season. Manchester City and Manchester United both finished with exactly 89 points. However, Manchester City won the title purely because their Goal Difference (+64) was superior to United's (+56), secured by Sergio Agüero's legendary 94th-minute goal.