American League Division Series Explained

When talking about the American League Division Series, the first round of the MLB playoffs that pits the league's division champions against each other. Also known as the ALDS, it decides which two clubs move on to the championship series.

The MLB postseason, the multi‑stage competition that follows the regular season includes the wild‑card game, the Division Series, the Championship Series, and the World Series. The ALDS requires a best‑of‑five format, meaning the first team to win three games advances. This structure creates high‑stakes moments early in October, because a single loss can tilt the momentum dramatically.

How the Series Fits Together

Each division winner, a team that finishes top of its AL division earns a spot in the ALDS automatically. If a wild‑card team has a better record than a division champ, it still faces a division winner in the next round. The series encompasses intense road trips, tactical pitching changes, and clutch hitting—all aimed at securing a win before the opponent can bounce back.

Fans often ask why the league uses a best‑of‑five instead of a longer series. The answer lies in balancing fairness with excitement. A short series influences managerial decisions, because there’s less room for error; a blown save can end the season. At the same time, it keeps the schedule tight, allowing the World Series to start on schedule.

If you’re curious about the history, the ALDS debuted in 1981 as a replacement for a strike‑shortened season and became permanent in 1995 when MLB added a third division. Since then, legendary moments—like dramatic walk‑off home runs and heated bullpen battles—have defined the round. Below you’ll find articles that break down recent matchups, discuss strategy, and highlight standout performances from the ALDS.