A middle happens when a line moves and you bet both sides at different numbers. Take a team at +7.5, then the other side at -3.5 after the line moves. If the favorite wins by 4 to 7, both bets win.
If the result misses the middle, one bet wins and one loses, so you lose roughly the vig.
Middles around key numbers are the most valuable.
How it works
A middle needs two things: a line that moves, and a bet on each side at different numbers. You take one side early, the line moves, and you take the other side at the new number. The gap between the two lines is your "window".
If the final result lands in the window, both bets win. If it lands outside, one wins and one loses, and because of the vig you lose a small amount, about 10 cents on the dollar at -110.
Middles come up most often with point spread and total bets after big line movement, for example when injury news moves a spread by several points. They're also easier to find if you hold accounts at several sportsbooks, since books don't always move at the same time. line shopping and middling go hand in hand.
A middle isn't the same as arbitrage. An arb guarantees a small profit. A middle risks a small loss for the chance of winning both sides. Windows that include key numbers, like 3 and 7 in the NFL, hit far more often than other windows.
Examples
- Example 1
Spread middle. You bet $110 on the underdog at +7.5 (-110). The line moves and you bet $110 on the favorite at -3.5 (-110). If the favorite wins by 4, 5, 6 or 7, both bets win: +$200. Any other result: one wins $100, the other loses $110, so you're down $10.
- Example 2
Totals middle. You bet $110 on over 44.5 early in the week. The total rises to 47.5 and you bet $110 on the under. A final total of 45, 46 or 47 wins both bets for +$200. Anything else costs you $10.
Common questions
How often does a middle hit?
It depends on the size of the window and which numbers it covers. A one-point window rarely hits, while a window that includes a key number like 3 or 7 in the NFL hits more often.
Is middling the same as arbitrage?
No. Arbitrage locks in a small guaranteed profit. A middle risks a small loss, roughly the vig, for the chance that both bets win.