The Setup
Arbitrage in baseball player props doesn't come up this clean very often. Today we have a 9.94% guaranteed profit window sitting open between theScore Bet and Novig on a batter hits/runs/RBIs over market. That's not a projected edge — that's a locked return, regardless of what the batter does, as long as you get both sides down before the lines move.
Let me walk through exactly what's happening and why this kind of gap opens up in the first place.
The Books and the Lines
- theScore Bet: Over at +125
- Novig: Under (the opposing side, exchange-priced, no vig baked in)
TheScore Bet is offering the over at +125 — that's $2.25 returned per dollar risked. On the other side, Novig's peer-to-peer exchange is pricing the under at odds that, combined with the +125, produce a 9.94% guaranteed margin across both legs.
The Math, Plain English
Here's how arbitrage math works. You're trying to find two lines where the sum of the implied probabilities across both outcomes is less than 100%. When it drops below 100%, the gap is your profit.
Step 1: Convert the odds to implied probabilities.
- +125 (Over at theScore Bet) → implied probability = 100 / (125 + 100) = 44.44%
For the arb to close at 9.94% profit, the under side needs to carry an implied probability that, when added to 44.44%, gives us our total book.
Total implied probability in an arb = 100% / (1 + profit%) = 100 / 1.0994 ≈ 90.96%
That means the under is carrying roughly 46.52% implied probability on Novig — which translates to approximately -115 equivalent odds.
Step 2: Calculate the stakes.
Let's say you have $1,000 to deploy.
- Stake on the Over (theScore Bet at +125): $511.80
- Stake on the Under (Novig): $488.20
If the Over hits: $511.80 × 2.25 = $1,151.55 returned. Profit = $151.55. If the Under hits: $488.20 wins on Novig at the corresponding odds. After subtracting the losing leg ($511.80), you're in the same ballpark.
Either way, you're clearing roughly $99.40 on a $1,000 total outlay. That's the 9.94%.
The numbers shift slightly based on exact Novig exchange pricing at the moment you execute — peer-to-peer markets move in real time — but the framework holds.
Why Does This Arb Exist?
This is worth understanding because it'll keep happening, and knowing the mechanics helps you move faster when you spot it.
Traditional sportsbooks like theScore Bet price props through a model that factors in their risk exposure, liability across their book, and sometimes just where their traders are focused. Player prop markets — especially multi-stat combo lines like hits/runs/RBIs — get less attention than totals or moneylines. That means pricing inefficiencies linger longer.
theScore Bet also has a history of being a touch more aggressive on plus-money prop prices, likely to drive handle and engagement from recreational bettors who like the upside of a +125 on a combo prop. From a business standpoint, it makes sense. From an arb hunter's standpoint, it's a gift.
Novig, operating as a no-vig peer-to-peer exchange, doesn't have that same structural incentive. The odds there are set by the market — sharps posting lines against each other, not a trading desk managing a liability book. That tends to produce tighter, more accurate pricing. When you have one book pricing a market for engagement and another pricing it for accuracy, gaps open up.
The 9.94% spread here is wide enough that one of these lines is clearly off consensus. Based on Pinnacle's no-vig market data, which is often the closest thing to a "true" line in North American betting markets, the over at +125 looks generous relative to fair value. That's where the arb originates: theScore is hanging a number that a market-priced exchange would never post at that level.
Why Novig Is the Right Side to Lock
There are a few ways to take the under here — you could shop other books, look at the exchange on a competitor, etc. But Novig is worth calling out specifically for this kind of play.
No vig means no embedded margin on your side. When you leg into an arb and one side has a 5–8% book baked into it, you're eating into your guaranteed profit before you even get started. Novig removes that. You're trading at fair value, and the spread is pure.
Limits don't get slashed after a winning run. This is the quiet killer at traditional books. Run a few arbs through FanDuel or BetMGM and your limits on player props start shrinking within weeks. Novig operates on a peer-to-peer model — you're matched against another bettor, not flagged by a risk team. Repeat volume doesn't get you profiled the same way.
Exchange pricing stays honest. Because Novig's lines emerge from market participants rather than a centralized trading desk, the under price you see is genuinely what the market thinks. There's no artificial shade applied to protect the house.
For serial arb players, these three things compound over time. The under leg of this trade lives in a cleaner environment.
Execution Notes
A few things to be aware of before pulling the trigger:
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Speed matters. A 9.94% arb on a player prop won't stay open long once it's visible. TheScore Bet will adjust if handle comes in on the over, or Novig's exchange will reprice as bettors match against it.
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Check the line one more time before placing both legs. Confirm the theScore Bet price is still +125 and verify the Novig exchange pricing in real time. Execute the larger implied-probability side first (typically the under at Novig here) since that leg has less slippage risk.
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Manage your bankroll across legs. The stake split above is approximate. Run your own Kelly-adjusted calculation based on your actual Novig price at execution time.
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Prop limits vary. If theScore Bet limits your stake on this market below what you need to hit your target return, the math changes. Size accordingly.
Bottom Line
A 9.94% guaranteed return on a baseball player prop is a real number today. TheScore Bet is pricing this batter hits/runs/RBIs over at +125 — a level that creates a clean arb window against the fair-value pricing at Novig. The gap exists because these two books price the same market through fundamentally different mechanisms, and today they're far enough apart to exploit.
If you're not already set up on the exchange side of this trade, get your Novig account in place here. Peer-to-peer, no-vig, and built for the kind of bettor who actually understands what's in this article.
The window is open. Check the lines, run the split, and execute before it closes.