Run line betting in Minor League Baseball functions the same as in MLB, with the standard spread set at 1.5 runs. A -1.5 favorite must win by two or more runs to cover, while a +1.5 underdog can lose by a single run and still cash. Unlike football or basketball where spreads shift based on perceived margins, baseball's run line is almost always fixed at 1.5, with the odds adjusting instead to reflect the implied probability of covering.
The MiLB run line market offers distinct value when bettors identify mismatches in pitching depth — a common occurrence in the minors where organizations frequently shuffle arms between levels. Blowouts happen more often in MiLB than in the majors due to wider talent gaps between rosters, making favorites on the run line appealing in spots with a clear pitching edge. However, the vig on MiLB spreads tends to run higher than on moneylines or totals, partly because books face thinner betting volume and greater uncertainty in these markets. Comparing the juice across sportsbooks becomes especially important here, as even small differences in vig compound meaningfully over a full minor league season's worth of wagers.
Analysis updated September 13, 2026. Odds data above refreshes hourly.
Cross-Sport spreads Vig Comparison
MiLB spreads averages 6.75% vig across 7 sportsbooks. Here's how that compares to other active sports:
| Sport | Avg Vig | vs MiLB |
|---|---|---|
| MiLB | 6.75% | — |
| KBO | 6.41% | MiLB runs 0.34 pts higher |
| MLB | 4.54% | MiLB runs 2.21 pts higher |
| NPB | 7.89% | MiLB runs 1.14 pts lower |
| CFL | 4.86% | MiLB runs 1.89 pts higher |
Vig Rankings
| # | Sportsbook | Vig | Grade | Events |
|---|---|---|---|---|
| 1 | Caesars | 5.02% | C+ | 1 |
| 2 | theScore Bet (ESPN Bet) | 5.98% | C+ | 1 |
| 3 | BetOnline.ag | 6.03% | C | 1 |
| 4 | Bovada | 6.99% | C | 1 |
| 5 | BetRivers | 7.39% | D | 1 |
| 6 | FanDuel | 7.41% | D | 1 |
| 7 | Hard Rock Bet | 8.42% | D- | 1 |
Frequently Asked Questions
Which sportsbook has the lowest MiLB spreads vig?
Caesars currently has the lowest vig at 5.02%, earning a grade of C+.
What is vig (vigorish) in sports betting?
Vig — short for vigorish, also called juice or overround — is the margin a sportsbook builds into its odds. It's the difference between the true probability of an outcome and what the odds imply. Lower vig means you keep more of your winnings on every bet. For example, a standard -110/-110 line has about 4.76% vig.
How often is this data updated?
We pull fresh odds from The Odds API every hour, on the hour (UTC). Each snapshot captures the latest lines from every sportsbook that has posted odds. The timestamp at the top of the page shows the most recent refresh.
How is the vig grade calculated?
Each sportsbook is graded on average vig: A+ (under 2%) is exchange-level pricing, A (2–3%) very competitive, B+ (3–4%) above average, B (4–5%) the industry standard, C+ (5–6%) slightly below average, C (6–7%) below average, D (7–8%) high vig, D− (8–10%) very high, F (10%+) predatory.
Why does lower vig matter for bettors?
Lower vig directly impacts your long-term returns. A bettor placing $1,000 per week at a book with 4% vig loses roughly $40/week to the house edge. At 2% vig, that drops to $20/week — a $1,040 difference over a year. For serious bettors, shopping for lower vig is one of the most reliable ways to improve profitability.
What sportsbooks do you track?
We track both regulated US sportsbooks (DraftKings, FanDuel, BetMGM, Caesars) and offshore books (Bovada, BetOnline, MyBookie, BetUS, LowVig.ag, BetAnything). Data comes from The Odds API, which aggregates real-time lines from licensed sources.
How We Calculate These Numbers
- Data Source
- All odds on this page come from The Odds API, which aggregates real-time lines from licensed US and offshore sportsbooks. We track moneyline, spread, and totals markets across every sport with active betting lines.
- Update Frequency
- We pull a fresh snapshot of every tracked market every hour, on the hour (UTC). Each snapshot captures the latest lines from every sportsbook that has posted odds for a given event. The timestamp at the top of each page tells you exactly when the data was last refreshed.
- Vig Calculation
- Vig (short for vigorish, also called juice or overround) measures the margin a sportsbook builds into its odds. We calculate it by converting the odds on each side of a market to implied probabilities, summing those probabilities, and subtracting 100%. For example, a market priced at -110/-110 implies 52.38% on each side — a total of 104.76%, meaning a vig of 4.76%. Lower vig means better value for bettors because you keep more of your winnings.
- Per-Market Breakdown
- We compute vig separately for each market type: moneyline (h2h), point spreads, and totals (over/under). The "average vig" shown for each sportsbook is the mean across all market types weighted by the number of events sampled in each market.
- Grading Scale
- Every sportsbook receives a letter grade based on its average vig: A+ (under 2%) is exchange-level pricing. A (2–3%) is very competitive. B+ (3–4%) is above average. B (4–5%) is the industry standard — a -110/-110 line is 4.76%. C+ (5–6%) is slightly below average. C (6–7%) is below average. D (7–8%) is high vig. D− (8–10%) is very high vig. F (10%+) is predatory pricing. See the full Vig Index Methodology for formulas, worked examples, and known limitations.
- Trend Tracking
- We store daily snapshots for 30 days, allowing us to show 24-hour and 7-day vig trends. A downward trend (improving) means sportsbooks are tightening their lines — often in response to increased competition or higher betting volume as a season heats up.