The Standings, Games Back and the Magic Number
How to read a division race, including the number that tells you exactly when it is over.
What it actually is. Games back is the average of the difference in wins and the difference in losses between a club and the leader, which is why it appears in half games. The magic number is the combined total of wins by the leader and losses by the chaser needed to clinch: when it reaches zero the race is decided. Ties are broken by head to head record first, then by intradivision record, with no tiebreaker games since 2022.
What somebody who knows the game gets out of it. The magic number is the most useful thing on a standings page and almost nobody uses it, because it converts a vague sense of a race into an exact count. It also makes clear something people find counterintuitive: a lead of five games in mid September is far more decisive than a lead of five games in July, because what matters is the lead relative to the games remaining, and the magic number is exactly that quantity.
The numbers worth knowing. Magic number equals games remaining for the leader plus one, minus the difference in losses. Elimination number is the same thing from the chaser's point of view.
What people get wrong about it. Run differential is a better predictor of a club's remaining games than its record is. A club two games up with a worse run differential is usually the underdog in the race despite leading it, which is what the Pythagorean expectation captures.
At Little League and travel ball. Pool play standings use their own tiebreakers, and they are not the same as the professional ones: run differential capped per game, runs allowed, then head to head or a coin flip. Checking them before Saturday is the difference between knowing what Sunday needs and finding out afterwards.
Batter's Eye: look up anything in baseball