How to Bet on the 2026 World Cup: A Field Betting Arbitrage Strategy

The 2026 FIFA World Cup kicks off on June 11 in Mexico City, with 48 teams competing across the United States, Mexico, and Canada through July 19. It's the biggest World Cup in history — and on prediction markets, it might also be one of the best opportunities for field betting I've ever seen.

On Episode 7 of World at Odds, I broke down the same field betting arbitrage strategy I've been running on the Democratic nomination market — except applied to soccer. The numbers are compelling: when you add up the price of every team on Polymarket, the total comes to just 102.2%. That means if you bought every single one of the 48 teams, you'd only lose 2.2 cents per dollar. Eliminate a handful of teams that have zero realistic chance, and you're in profit territory.

What Is Overround and Why Does 102.2% Matter?

In any market where exactly one outcome must win, you can add up the implied probabilities of all outcomes to get the overround. If you could buy one share of every outcome and the total cost was exactly $1, you'd break even. If the total is above $1, the house has an edge. If it's below $1, you have an edge.

Traditional sportsbooks run World Cup winner markets at 115–125% overround — meaning they're charging you 15 to 25 cents of margin per dollar. That's their profit, baked into every bet. Polymarket's World Cup winner market sits at 102.2%. The margin is almost nothing.

The Strategy: Buy the Favorites, Skip the Noise

My approach is straightforward. I looked at every team's Polymarket price, compared them to sportsbook consensus odds, identified where prediction market prices were trading at a discount to the sportsbook line, and built a basket of seven favorites plus a few value long shots.

The top of the market looks like this:

Team	Polymarket Price	Sportsbook Consensus	In My Basket?
France	17¢	~18%	Yes
Spain	15¢	~18%	Yes
England	~10¢	~13%	Yes
Argentina	~10¢	~10%	Yes
Brazil	~10¢	~10%	Yes
Germany	~5¢	~6%	Yes
Netherlands	~3¢	~4%	Yes
Portugal	~8¢	~7%	No
Norway	~2¢	~2%	No
Japan	~2¢	~2%	No

On top of the top seven, I added Belgium (better value than its price suggests), Mexico (host nations historically overperform), Switzerland (a consistent deep-run team), and Senegal (the highest-rated African team in FIFA rankings). My total basket of 11 teams comes to about 75 cents per share.

If any of those 11 teams wins the World Cup, I collect $1. That's a 33% return on capital — before I even try to weight the buys.

Why I'm Not Buying Equal Shares

Here's where the strategy gets more aggressive. You don't have to buy one share of each team. If you weight your purchases toward the teams you think are undervalued, you can turn a 33% floor into a much larger return on specific outcomes — while still maintaining the guaranteed-profit floor on the rest of the basket.

For example, Spain is trading at 15 cents on Polymarket but sportsbooks have them closer to 18%. If Spain wins and I've loaded up on them, I'm collecting $1 on shares I bought for 15 cents. But if Belgium pulls off a miracle and wins at 2 cents per share, I'm looking at a 50x return on that position.

As I said on the show: I'm still going to try to eke out a bit more profit on teams I think are undervalued. If the favorites win, I eke out a profit. If one of my value picks wins, I make a lot more.

Polymarket vs. Sportsbooks: Why This Works on Prediction Markets

You can't run this strategy at a traditional sportsbook. Here's why.

A sportsbook's World Cup winner market might have France at +450, Spain at +550, and England at +650. Those look like decent odds. But when you convert every team's line to implied probability and add them up, the total comes to 120% or more. The 20% gap is the sportsbook's margin — the vig. You'd need to overcome that margin before any field betting strategy could be profitable.

Polymarket's 102.2% overround is a fundamentally different structure. The margin is so thin that skipping just a few no-chance teams puts you in positive expected value. You can use our arbitrage calculator to model this yourself — plug in the teams, their prices, and see what your guaranteed return looks like across different elimination scenarios.

The Set-It-and-Forget-It Rule

On this episode, we also talked about the Masters — and how both Andrew and I managed to lose money on a tournament where Andrew literally held the eventual winner at 7 cents per share. Andrew's postmortem was brutal: he sold 90% of his Rory McIlroy position during the tournament, took that money, bought four other golfers at mid-tournament prices, and all four went to zero. He turned a 3-unit winner into a 4.5-unit loss.

The lesson we both took away: when you're running a basket strategy, set it and forget it. Don't live-trade events you know nothing about. Don't get bored. And especially don't trade drunk on pasta in Italy.

I'm applying that lesson to the World Cup. My basket is set. Unless something drastic changes — a star player injury, a team getting eliminated in qualifying — I'm not touching it.

What Could Go Wrong

A team outside your basket wins. If you buy 11 of the 48 teams and an outsider takes it, you lose your entire basket cost. The 2022 World Cup reminded everyone that upsets happen — Morocco made the semifinals. The wider your basket, the safer you are. At 75 cents for 11 teams, I've accepted that risk.

Capital lockup. The World Cup runs June 11 to July 19. That's roughly three months from now. Your capital is tied up until resolution. On an annualized basis, a 33% return over three months is excellent, but you can't touch the money until then.

Price movement before the tournament. As the World Cup approaches, prices will shift. Favorites may get more expensive (reducing your edge if you wait) or cheaper (if news breaks). Getting in early locks in the current spread.

Platform risk. As with any prediction market trade, there's platform risk. Polymarket is the largest prediction market by volume, but regulatory changes or technical issues are always possible.

48 Teams Is Actually Good for This Strategy

On the show, we complained about the expanded 48-team format. It's too many teams. A lot of the group stage games will be lopsided. The NHL playoff rant about seven-game first-round series lasting two months? Same energy. These tournaments are getting bloated.

But for field betting, the bloated format actually helps. More teams means more possible outcomes, which means more noise in the pricing, which means more opportunities for the overround to stay low. The more outcomes there are, the harder it is for the market to price every single one efficiently. That's where the edge lives.

How to Get Started

If you want to run a version of this strategy, here's the process:

Step 1: Check the overround. Go to the Polymarket World Cup winner market and add up the prices. If the total is still near 102%, you're in good shape. Use our arbitrage calculator to compute your edge.

Step 2: Build your elimination list. Which teams have zero chance? Remove them. Every team you can confidently eliminate moves your total cost further below $1.

Step 3: Compare to sportsbooks. Use our odds converter to translate sportsbook lines to implied probability, then compare to Polymarket prices. Where the prediction market is cheaper than the sportsbook consensus, that's where value might be sitting.

Step 4: Decide your weighting. Equal shares gives you a guaranteed floor. Weighted shares toward your highest-conviction picks gives you more upside with the same downside floor.

Step 5: Set it and forget it. Don't live-trade. Don't panic. Don't open Polymarket after wine.

Hear the full breakdown on Episode 7 — including the Masters postmortem, the aliens money glitch, weather market betting, and our Stanley Cup picks.