The World Cup’s magic lives in the impossible moments. Not in Brazil lifting another trophy or Germany grinding through another group stage — the magic lives in the 38th minute when a team nobody gave a chance scores a goal that silences 60,000 people and rewrites a narrative that was supposed to be already written. I have spent nearly a decade studying the patterns behind these moments, not as fairy tales, but as data points that reveal something the betting market consistently underestimates: at a World Cup, the gap between the best and the rest is narrower than the odds suggest.
The 2026 World Cup, with its expanded 48-team format and 16 debutant or long-absent nations, is primed for upsets on a scale we have not seen since the tournament expanded to 32 teams in 1998. Understanding why upsets happen — not just celebrating them after the fact — is the difference between a punter who watches the drama unfold and a punter who profits from it.
The Upsets That Defined World Cup History
Cameroon 1-0 Argentina, Milan, 1990. The defending champions, Diego Maradona and all, walked onto the pitch for the opening match of Italia 90 expecting a formality. Cameroon had other ideas. Francois Omam-Biyik’s header in the 67th minute was the goal, but the story was the performance — Cameroon pressed Argentina with a ferocity that the South Americans simply could not handle, picking up two red cards in the process but winning the match and launching a run that would take the Indomitable Lions all the way to the quarter-finals. That result did not just shock the footballing world. It fundamentally altered how people assessed African teams at World Cups and opened the door for every underdog story that followed.
South Korea’s entire 2002 campaign belongs on this list, not as a single result but as a sustained act of collective defiance. Co-hosting the tournament gave South Korea an advantage, but no amount of home support explains beating Spain and Italy — two former world champions — in consecutive knockout rounds. The tactical plan was revolutionary for the era: a high-pressing, ultra-fit squad that ran further and harder than any opponent, exploiting the June heat in East Asia that European teams had not prepared for. Sound familiar? Japan used a nearly identical approach to beat Germany and Spain twenty years later in Qatar.
Senegal 1-0 France, Seoul, 2002. The defending champions again — and the pattern is clear. France arrived in South Korea and Japan as the most decorated team in the tournament, having won the 1998 World Cup and Euro 2000. Senegal, making their World Cup debut, ripped up the script within 30 minutes. Papa Bouba Diop’s goal was scrappy and chaotic, but the performance was anything but. Senegal’s midfield, featuring several players from Ligue 1 who knew the French players intimately, pressed with an intensity that caught France completely off guard. France went home in the group stage without scoring a single goal.
The most recent entry in the canon: Saudi Arabia 2-1 Argentina, Lusail, 2022. Lionel Messi opened the scoring from the penalty spot, and everything appeared to be following the expected script. Then, in a five-minute span early in the second half, Saudi Arabia scored twice — Saleh Al-Shehri and Salem Al-Dawsari producing goals that will be replayed for decades. The tactical explanation was a staggeringly high defensive line by Saudi Arabia that caught Argentina offside repeatedly in the first half, then a second-half adjustment that turned the game’s entire structure on its head. It was the biggest upset by match odds in World Cup history, and it happened in the opening round of the group stage — exactly the phase of the tournament where upsets are most common.
What connects all of these results is not luck. It is preparation meeting opportunity. Every great World Cup upset features an underdog that had a specific tactical plan designed to neutralise the favourite’s strengths, and a favourite that entered the match with the complacency that comes from believing the result is already decided. That combination — preparation against complacency — is the engine of every World Cup shock, and it will be present in dozens of fixtures across the 2026 group stage.
Anatomy of an Upset: What the Data Shows
Between 1998 and 2022, there have been 37 matches at the World Cup where the pre-match betting favourite at odds of 1/3 or shorter lost. That is 37 results across seven tournaments — roughly five per World Cup — where the market got it comprehensively wrong. The distribution tells a story: 28 of those 37 upsets occurred in the group stage, with the remaining nine in the knockout rounds. The group stage is where upsets live, and the reason is structural.
In the group stage, the favourite has less at stake in any individual match because qualification is a three-game process. A loss in the opener can be recovered with wins in the next two fixtures. That safety net, paradoxically, breeds the complacency that underdogs exploit. In the knockout rounds, elimination is immediate, and favourites play with a desperation that closes the quality gap. The 2026 format amplifies this dynamic: with the top two plus the best third-placed teams qualifying from each group, even a group-stage loss is unlikely to eliminate a genuine favourite. That creates more room for upsets in the early rounds than any previous World Cup has offered.
The data also reveals a pattern in the timing of upset goals. Of the 37 major upsets since 1998, 23 saw the underdog score the opening goal. When the lesser team scores first, the psychological burden shifts to the favourite, who must now chase the game against an opponent with nothing to lose and everything to gain from defending a lead. The tactical implications are profound: underdogs that set up to defend deep and strike on the counter are statistically more likely to cause an upset than underdogs that try to match the favourite’s style of play. The low block works. It has always worked. And at a World Cup where first-round fixtures carry reduced stakes for the favourites, it will work again.
Another factor the market underweights is geographical familiarity. Upsets are disproportionately common when the underdog is more familiar with the playing conditions than the favourite. South Korea’s 2002 run was aided by home advantage and acclimatisation to the heat. Saudi Arabia’s 2022 shock happened in Qatar, a neighbouring country whose climate and culture were home territory. In 2026, CONCACAF teams — Mexico, the USA, Canada, and the Caribbean qualifiers — will have a tangible advantage in venues they know and time zones they are accustomed to. The market rarely prices this advantage into the odds, which creates a systematic edge for punters willing to back CONCACAF sides in early-round mismatches.
Ireland’s Own Giant-Killing Moments
We do not get to the World Cup often, but when we do, we make sure the giants know we were there. Ray Houghton’s goal against Italy at USA 94 — a looping shot from outside the box in the opening group match at Giants Stadium, East Rutherford, New Jersey — remains one of the most celebrated moments in Irish sporting history. The same Giants Stadium that sits next to MetLife, where the 2026 World Cup final will be played. The geography alone gives that memory a resonance that no other team at this tournament can claim.
Italia 90 was the tournament that defined Irish football’s relationship with the World Cup. Reaching the quarter-finals as a team that nobody outside Ireland expected to survive the group stage — beating Romania on penalties along the way — created a template for how Irish fans engage with the tournament. We understand what it feels like to be the underdog. We understand the euphoria of a result that the rest of the world dismisses as a fluke. And we understand that the fluke is never really a fluke — it is preparation, organisation, and a refusal to accept the narrative that the bigger team always wins.
That understanding shapes how Irish fans watch World Cup upsets involving other teams. When Cameroon score against Argentina, or Saudi Arabia stun Messi, or South Korea beat Spain, Irish fans respond with a genuine emotional investment that goes beyond neutral appreciation. We see ourselves in those moments. We see the smaller nation, the squad without the household names, the fans who travelled despite knowing the odds, producing something that the football establishment said was impossible. That empathy is one of the reasons the Irish are considered among the best football supporters in the world — we do not just watch upsets, we feel them, because we have been on that side of the scoreline and we know what it means.
The night Troy Parrott scored against Portugal in Dublin during the 2026 qualifiers was our most recent giant-killing moment, even if it ultimately did not lead to qualification. Portugal, the top seed in Group F, came to the Aviva Stadium as overwhelming favourites and left beaten. Parrott’s goal — and the atmosphere that surrounded it — proved that the Irish capacity for the upset remains intact, even if the World Cup itself continues to elude us. That spirit will be present in every pub in Ireland when the 2026 underdogs take the field.
Where Upsets Could Happen in 2026
The expanded format creates more potential upset fixtures than any previous World Cup. With 48 teams and 12 groups, the number of matches between top seeds and genuine minnows has roughly doubled compared to the 32-team format. Not every mismatch will produce a shock, but the law of averages guarantees that several will — and the smart punter identifies the most likely candidates before the tournament begins.
Group A: Czechia beating Mexico on opening night at the Estadio Azteca. This is the high-profile upset I rate most likely in the first round. Mexico will face enormous pressure as hosts, the altitude in Mexico City affects visiting teams more than domestic sides, and Czechia — the team that knocked Ireland out on penalties — have a squad with enough European league quality to compete in a one-off fixture. The Azteca’s atmosphere will be intense, but pressure can paralyse as easily as it inspires, and Mexico’s recent form has been inconsistent enough to warrant caution.
Group C: Scotland drawing with or beating Brazil. I outlined this case in the predictions section, but it merits repetition here. Scotland’s 5-3-2 defensive setup is specifically designed to neutralise teams with superior individual talent, and Brazil’s attacking structure has been vulnerable to precisely this kind of organised resistance in recent South American qualifiers. The fixture carries enough emotional weight — the Tartan Army against the Seleção — to create an atmosphere where Scotland’s players perform above their usual level. A draw is the most likely upset outcome, but a Scottish win at 8/1 or 9/1 is not outlandish.
Group D: Turkey beating the USA. Turkey’s squad is one of the strongest in Pot 3, and the USA’s home advantage will be diluted by a neutral crowd that includes large Turkish and European contingents. Arda Güler is the kind of player who can produce a moment of magic that swings an entire match, and Turkey’s experience in high-pressure European qualifiers translates directly to the intensity of a World Cup group match. The USA, for all their improvement over the last cycle, have not been tested at this level with genuine expectations on their shoulders.
Group G: Egypt beating Belgium. Mohamed Salah’s final World Cup, against a Belgian side in transition — this is the kind of fixture where individual brilliance meets collective decline. Belgium’s golden generation is ageing, and their defensive structure has been suspect since the 2022 World Cup, where they were eliminated in the group stage. Salah, still one of the most lethal attackers in world football, needs only one chance to score, and Egypt’s defensive organisation under their current setup is solid enough to contain a Belgian attack that lacks the cutting edge it possessed four years ago.
Betting on the Unthinkable: Odds and Approaches
The worst way to bet on World Cup upsets is to back the underdog on the match result at long odds and hope for the best. That is a lottery ticket, not a strategy. The best way to profit from upsets is to use markets that capture the underdog’s most likely path to a result without requiring them to win outright.
Double chance — draw or win — is the most reliable upset market. If you believe Scotland can take points off Brazil, double chance at around 7/2 to 4/1 captures both a draw and a win in a single bet. The probability of landing is significantly higher than the straight win, and the payout is still attractive enough to justify the position. Across the seven tournaments since 1998, backing the underdog on double chance in the top 20 biggest mismatches would have produced a positive return — the draw rate alone in these fixtures is high enough to make the market profitable over a large enough sample.
Asian handicap with a positive line is another approach. If you back Haiti +2.5 against Brazil, you are betting that Haiti will not lose by three or more goals. That is a lower bar than winning the match, and the odds on the positive handicap are often generous because the market assumes the favourite will dominate. At the 2022 World Cup, seven of the ten biggest pre-match favourites failed to cover a -2.5 handicap — meaning the underdog on +2.5 would have won seven out of ten bets. The expanded format in 2026, with more mismatches, should produce similar opportunities.
The timing of your bet matters as much as the selection. Upset odds tend to shorten in the 24 hours before kick-off as public money flows in on the underdog — the “everyone loves an upset” effect. The best value on upset bets is typically available a week or more before the match, when the market is thinnest and the bookmakers have not yet adjusted for the late surge of underdog money. If you have identified your upset candidates now, placing the bet early locks in the longest odds.
The 2026 World Cup will produce upsets. It always does. The question is whether you are positioned to profit from them or simply positioned to watch them unfold on your sofa. The data is clear: the group stage favours underdogs more than the market acknowledges, organised defences beat talented attacks more often than the odds imply, and the expanded format creates more opportunities for shocks than any previous tournament. The greatest World Cup upsets are not anomalies — they are features of how the tournament works, and the punter who treats them as predictable patterns rather than beautiful accidents has an edge that most of the market does not.