The Biggest World Cup Upsets, by the Numbers

The shocks I remember best are the ones nobody had any business expecting: a team of American part-timers beating England, Saudi Arabia knocking over the eventual champions in their opening game. What makes those moments land is not the result on its own but the distance between it and how sure everyone was beforehand. And once you start measuring that distance, the World Cup’s great upsets stop looking random — they keep sharing the same handful of features, which makes the next one a little less astonishing, if never any less fun.

What "upset" means in numbers

Before listing them, it is worth being honest about measurement. The cleanest proxy for a pre-match expectation gap is bookmaker odds, and reliable odds only exist for the modern era; for matches from the 1950s the "favourite" is a judgement from reputation and form, not a quoted price. So I treat the older entries qualitatively — everyone agreed who was supposed to win — and the recent ones with a bit more numerical confidence. In every case the underlying idea is the same: how far the result sat from what a neutral, informed observer would have forecast. That is the same lens behind expected goals at the match level — what should have happened, set against what did.

USA 1–0 England, 1950

The benchmark by which all later upsets are measured. England, playing in their first World Cup, were among the most respected football nations on earth; the United States were part-timers assembled from disparate backgrounds. The result — a single goal by Joe Gaetjens settling it — was so far outside expectation that the story (probably apocryphal) goes that some newspapers assumed the scoreline was a transmission error and printed England winning. There are no odds to quote. There does not need to be. By reputation gap alone, this is still the widest in World Cup history.

Cameroon 1–0 Argentina, 1990

The opening match of Italia ’90 pitted the defending champions, with Diego Maradona at the height of his fame, against a Cameroon side most observers expected to be tournament filler. Cameroon won 1–0 — and did it down to nine men, having had two players sent off. The expectation gap was enormous and the manner of it larger still: the holders, beaten by a team playing the last quarter of the match a man and then two men short. Cameroon went on to reach the quarter-finals, the first African side to do so, which suggests the result was less of a fluke than it looked in the moment.

Senegal 1–0 France, 2002

Another opening match, another reigning champion humbled. France arrived in 2002 as both World Cup holders and reigning European champions, one of the strongest squads of the era. Senegal were tournament debutants. Senegal won 1–0 through Papa Bouba Diop, and it set the tone for a French campaign that ended without a single goal scored and a group-stage exit. Like Cameroon, Senegal then backed it up, reaching the quarter-finals themselves — a recurring feature of the great upsets, which we return to below.

The teams that beat Germany: South Korea 2018, Mexico 2018

Germany’s defence of its title in 2018 ended in the group stage, sealed by a 2–0 defeat to South Korea — a result almost no model gave meaningful weight to beforehand, with the defending champions eliminated at the first hurdle for the first time in modern memory. Mexico had already beaten Germany 1–0 in the same group’s opening round. Two separate upsets, compounding into one of the great tournament collapses. The expectation gap on each individual match was wide; the gap on "Germany fails to escape the group" was wider than either.

Saudi Arabia 2–1 Argentina, 2022

The most recent entry, and one of the few where we have firm odds to anchor the gap. Argentina entered 2022 among the clear favourites and were on a long unbeaten run; Saudi Arabia were rank outsiders for the match by any market you cared to check. Argentina led at half-time and were the better side on the underlying numbers, then conceded twice in the second half and lost 2–1. The instructive footnote: Argentina went on to win the whole tournament. The single-match upset was real and enormous; it told you almost nothing about where the trophy would end up — a clean illustration of how one result can be a genuine shock and still be poor evidence about overall quality.

What the great upsets have in common

Pull the cases together and a few features recur with striking regularity.

They cluster in opening matches. Cameroon–Argentina, Senegal–France, Saudi Arabia–Argentina — all first games. A favourite’s opener is fertile ground for an upset: rust, the weight of expectation, an opponent with nothing to lose and everything sharpened for one performance. The underdog can pour its whole tournament into ninety minutes the favourite is still settling into.

They are usually 1–0 or one-goal margins. Football is low-scoring, and that is precisely why upsets are possible at all. In a sport that averages under three goals a game, a single moment — one set piece, one counter, one goalkeeping error — can outweigh ninety minutes of territorial superiority. The favourite often has the better of the underlying numbers and still loses, because chances created and goals scored diverge most violently in exactly these small-sample, one-event matches.

The good ones were not flukes. Cameroon and Senegal both reached the quarter-finals; South Korea’s win was part of a wider story; Saudi Arabia beat a side that would go on to win it all. The biggest upsets tend to be produced by teams genuinely better than their billing on the day, not merely lucky — which is part of why a few of them seed the most improbable tournament runs rather than fading the next week.

None of this makes the next shock predictable. It makes it legible. The structural ingredients — a low-scoring game, a favourite carrying expectation, a focused underdog, an opening match — are present at every World Cup, which is the deeper reason the tournament keeps producing results nobody saw coming. It is built to.

Sources & further reading

• Free textbook: Chapter 20: Predictive Modeling — the theory behind this, at DataField.dev.
• FIFA — official match records and tournament archives for every World Cup result cited above.
• RSSSF — detailed historical results, line-ups and context for matches across the competition’s history.
• StatsBomb — methodology for the underlying-quality metrics used to separate genuine upsets from variance.
• FBref — match data and competition records for recent World Cups.