In KBO baseball, the spread — commonly referred to as the run line — is typically set at ±1.5 runs, mirroring the structure used in MLB. A favorite at -1.5 must win by two or more runs to cover, while an underdog at +1.5 simply needs to lose by one run or win outright. Unlike football or basketball, where spreads are adjusted to create roughly even action, the baseball run line stays fixed at 1.5 with the odds shifting on each side. Some books also offer alternate run lines at ±2.5 or higher for KBO games, providing additional risk-reward flexibility.
The run line becomes most valuable when targeting KBO teams with dominant bullpens or high-powered offenses that frequently produce blowout wins. Bettors should pay close attention to starting pitcher matchups, recent bullpen workloads, and the tendency of certain KBO stadiums — like Daejeon's compact park — to inflate run totals. Vig on KBO run lines tends to run slightly higher than on moneylines, as the market draws less volume and sharper action compared to MLB. Comparing spreads pricing across books is especially worthwhile here, since even small vig differences compound meaningfully over a full 144-game KBO season.
Cross-Sport spreads Vig Comparison
KBO spreads averages 6.05% vig across 16 sportsbooks. Here's how that compares to other active sports:
| Sport | Avg Vig | vs KBO |
|---|---|---|
| KBO | 6.05% | — |
| CFL | 5.14% | 0.91% higher |
| NCAAF | 4.70% | 1.35% higher |
| NFL | 4.73% | 1.32% higher |
| NFL Preseason | 4.59% | 1.46% higher |
Vig Rankings
| # | Sportsbook | Vig | Grade | Events |
|---|---|---|---|---|
| 1 | BetOnline.ag | 3.88% | B+ | 5 |
| 2 | LowVig.ag | 3.88% | B+ | 5 |
| 3 | Pinnacle | 4.84% | B | 5 |
| 4 | MyBookie.ag | 5.01% | C+ | 5 |
| 5 | DraftKings | 5.07% | C+ | 5 |
| 6 | FanDuel | 5.57% | C+ | 5 |
| 7 | BetMGM | 6.09% | C | 5 |
| 8 | Fanatics | 6.13% | C | 5 |
| 9 | Caesars | 6.40% | C | 5 |
| 10 | Hard Rock Bet | 6.42% | C | 5 |
| 11 | theScore Bet (ESPN Bet) | 6.48% | C | 5 |
| 12 | Bovada | 6.53% | C | 5 |
| 13 | Fliff | 7.11% | D | 2 |
| 14 | BetRivers | 7.72% | D | 5 |
| 15 | Bally Bet | 7.72% | D | 5 |
| 16 | ReBet | 7.97% | D | 5 |
Frequently Asked Questions
Which sportsbook has the lowest KBO spreads vig?
BetOnline.ag currently has the lowest vig at 3.88%, earning a grade of B+.
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 three times per day — at 6:00 AM, 2:00 PM, and 10:00 PM 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 a letter scale based on average vig: A+ (under 2%) is exceptional, A (2–3%) is excellent, B+ (3–4%) is above average, B (4–5%) is the industry standard, C (5–6%) is below average, and D (above 6%) indicates high-juice markets.
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, BetAnySports). 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 three times per day — at 6:00 AM, 2:00 PM, and 10:00 PM 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.