Middles
What it is
A middle is a two-sided bet where, if the final result lands between the two lines, both bets win. Worst case you lose the vig on one side. Best case you cash both. The Middles page surfaces every gap our scanner finds across books, scored by the probability the result lands inside.
When to use it
- You want asymmetric upside with capped downside.
- You see the same total or spread move 1-2 points across books and want to pounce.
- You like compounding bets where the outcome distribution skews in your favor.
How to read it
| Column | Meaning |
|---|---|
| Gap | How wide the middle window is (e.g. 2.5 points). Wider = bigger landing zone. |
| Side A / Side B | The two lines on the two books that form the window. |
| Hit Probability | Our estimated probability that the final result lands inside the window. |
| Net Cost | What you lose on the worst-case (lose one side, win the other). Usually a few cents per dollar staked. |
| Net Win | Profit if both sides cash (the middle hits). |
| EV | Hit probability times net win, minus miss probability times net cost. |
Worked example
Example
NFL: Eagles -3 vs Cowboys, total 47.5
Side A: Eagles -2.5 -110 (DraftKings) Side B: Cowboys +4.5 -105 (Caesars) Stake $100 each side Worst case: lose one, win one, net -$5 (just the juice) Middle hits if Eagles win by exactly 3 or 4: ~7-9% historical Net win on middle: ~$190 EV: ~+$13 per $100 staked
The 1-2 point window matters. Eagles winning by exactly 3 or 4 has happened often enough historically to make this +EV.
Common mistakes
- Sizing middles like single bets. Worst case is you lose juice on one side. Size for total exposure, not per leg.
- Forgetting key numbers. In NFL, 3 and 7 are landmines. A middle around 3 or 7 is worth more than around 2 or 5.
- Chasing 0.5 point gaps. Half-point middles almost never hit. Required gap depends on sport (NFL >= 1.5, NBA >= 2, MLB totals >= 0.5).
- Placing one leg and waiting. Lines move. Place both within seconds, or kill the trade.
- Mixing pre-game and live legs. Live odds and pre-game odds are different products. Do not assume one will hold.