MLB Sports Betting Index (SBI) Market Report – Sunday, August 31, 2025

The MLB betting markets are showing major shifts as we close out the month of August. Using the Raymond Report Sports Betting Index (SBI), we track how favorites, underdogs, and totals (Over/Under) are performing in both the short-term and long-term windows. Today’s snapshot tells us where the market is leaning — and where bettors can find value.

Straight-Up (SU) Favorites

• 1-Day: 47% – Neutral
• 3-Day: 56.3% – Neutral
• 7-Day: 57.6% – Bullish
• YTD: 55.8% – Neutral

📌 Analysis: Favorites cooled off yesterday (47% SU), but they remain strong over the last week (57.6%). This suggests chalk bettors may still have the upper hand in the short-term.

Totals (Over/Under)

• 1-Day: 33% Overs – Bearish
• 3-Day: 45.3% Overs – Neutral
• 7-Day: 48.7% Overs – Neutral
• YTD: 48.4% Overs – Neutral

📌 Analysis: Overs completely collapsed yesterday, with just 33% hitting. Pitching has dominated the board, making Unders the more reliable play for cautious bettors.

ATS Favorites (Runline)

• 1-Day: 40% – Bearish
• 3-Day: 50% – Neutral
• 7-Day: 52.7% – Neutral
• YTD: 51% – Neutral

📌 Analysis: Runline bettors took a beating yesterday, as ATS favorites hit just 40%. Despite that, the longer view remains steady, with no clear long-term edge.

Market Takeaway

The August 31 MLB SBI Report shows:

• Favorites are holding firm over the week but dipped yesterday.
• Overs were crushed (33%) — another reminder that blindly betting Overs can be dangerous when the market shifts.
• ATS (Runline) Favorites fell flat on Saturday, rewarding dog bettors in spots.

This is a neutral-to-bearish environment for Overs and ATS chalk, but SU favorites remain strong in the 7-day window.

👉 Smart bettors should consider selective favorites and continue monitoring totals — especially with pitchers locking down bats as playoff pressure builds.

📊 Stay Ahead of the Market
Track daily SBI trends and get the Raymond Report betting edge at ATSStats.com.