"ATS stands for against the spread. When you bet a team ATS, you are not just picking a winner. You are betting that a team will win by more than the spread, or lose by less than it. A team can win the game and still fail to cover if they do not win by enough."
"Sportsbooks are very good at setting lines. Their job is to balance action on both sides of a bet, and they employ sharp analysts who are aware of the same trends you are reading about. When a trend becomes widely known, it often gets priced in."
"Most teams only play five or six games in the tournament in a good run. A team going 5-1 ATS in the tournament over two years sounds significant, but six games is nowhere near enough data to draw reliable conclusions. The trend feels meaningful because humans are wired to find patterns."
Against the spread (ATS) trends track how teams perform relative to betting spreads rather than just wins and losses. During March Madness, bettors frequently reference these trends, such as teams covering at high rates or coaches rarely covering large spreads. However, ATS trends have significant limitations. Sportsbooks employ sharp analysts who are aware of the same trends and price them into their lines. Additionally, March Madness sample sizes are problematic—most teams play only five or six games in a tournament run, making six-game trends statistically unreliable. While trends are not worthless, they require critical analysis to determine if they reflect genuine patterns or merely coincidental patterns that humans naturally seek.
Read at Bleacher Nation
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