Definition
The opening line is the first odds posted by a sportsbook for an event, typically released days before game time. Opening lines are often softer (less accurate) than closing lines, creating opportunities for sharp bettors to capture value early.
Example
NFL opening lines release Sunday evening for the following week's games. The Chiefs open at -3, but by kickoff they're -4.5. Bettors who grabbed Chiefs -3 on Sunday got 1.5 points of value versus the closing line.
Common Questions
Are opening lines less accurate?
Are opening lines less accurate?
Yes, generally. Opening lines haven't been tested by sharp money yet. As sharps bet and information emerges (injuries, weather), lines become more efficient approaching game time.
Should I always bet opening lines?
Should I always bet opening lines?
If you have an edge, betting early locks in value before lines move against you. But if you're uncertain, waiting for more information might be better. Sharps typically bet early; squares bet late.