Most longshot betting advice falls into two camps: "never bet longshots" and "chase the big payday." Both are wrong. A longshot betting strategy isn't about avoiding or chasing underdogs — it's about knowing when the odds pay enough to make the risk worthwhile, and managing your money so you survive the long losing streaks in between.

Start with the uncomfortable truth

The house edge is larger on longshots than on favorites. Books inflate long odds more aggressively because casual bettors love the dream of a big score and rarely do the math. That means a random longshot is, on average, a worse bet than a random favorite.

So the strategy has to begin with a filter, not a feeling: only bet a longshot when you believe the odds are higher than the true probability. That's the definition of value, and it's the entire ballgame.

Rule 1: Bankroll management is the whole strategy

Longshots lose often. Even a genuinely good longshot bettor might win only 1 in 5 or 1 in 6 bets. That means losing streaks of 10, 15, even 20 bets are normal — not a sign the system is broken. If your stake size can't survive that variance, you'll be wiped out before the winners ever show up.

  • Bet small. A common guideline is 1–2% of your bankroll per longshot bet. At 1%, even a brutal 15-bet losing streak costs about 15% of your roll — survivable.
  • Keep a dedicated bankroll. Money set aside for betting, separate from your living money. Never chase a loss with rent or bill money.
  • Flat-stake or fractional. Don't double up after a loss to "get it back." That's the fastest way to zero.
The golden rule: a longshot's big payout only helps you if you're still around to collect it. Stake sizing, not picking, is what keeps you in the game.

Rule 2: Only bet where value actually exists

Value shows up in a handful of repeatable situations:

  • Public bias. Popular teams get bet heavily, which pushes their opponents' odds up. The underdog's price can drift beyond its true chance.
  • Overreaction to one result. A single bad game can send a team's odds tumbling further than the reality warrants.
  • Small, inefficient markets. Lower-profile leagues and props are priced less sharply than the marquee games, leaving more room for mispriced longshots.
  • Futures before the odds shorten. A promising team priced at +2500 in the offseason can shorten dramatically if things break right.

If you can't articulate why the odds are wrong, you don't have a value bet — you have a guess.

Rule 3: Shop for the best number

The same longshot is often priced differently across books. Getting +900 instead of +750 on the same bet is a huge edge over time, because longshot payouts are so sensitive to the number. Open accounts at a few reputable books and always take the best price.

Rule 4: Use the right tool for the job

  • Moneyline underdogs are the cleanest longshot — one bet, one outcome.
  • Parlays multiply the vig at every leg. A 5-leg parlay of "value" bets is usually just five margins stacked against you. Treat them as occasional entertainment, not strategy.
  • Futures tie up money for months and carry a large margin. Bet them sparingly and early.

The mistakes that quietly drain your bankroll

  1. Betting longshots for the thrill. If you need the payout to feel something, the book has already won.
  2. Chasing losses. Doubling down after a loss to "win it back" is how accounts go to zero.
  3. Ignoring the vig. Assuming "the odds say 20%, so it's 20%" forgets the book's margin.
  4. No record-keeping. If you don't track every bet, you can't know whether you actually have an edge.

Putting it together: a simple checklist

  1. Is this a value bet — do I believe the true chance is better than the implied odds? If not, pass.
  2. Is my stake 1–2% of my bankroll or less?
  3. Did I shop for the best price?
  4. Did I log the bet, the odds, and my reasoning?

A longshot strategy is really a value strategy with extra discipline. Next, learn the research process that finds those value spots: How to Pick Longshot Winners.