
Why league upsets are so rare
Luck evens out over a season. That is the whole point of a league, and it is why the richest clubs win most titles: a deep squad absorbs injuries, a large budget replaces form that fades, and 38 matches give quality time to show. For an outsider to win, everything that normally regresses has to hold. Key players must stay fit, the rivals must stumble at the same time, and the side must survive the moment, usually around March, when opponents start treating it as a contender.
The six champions below managed it in different ways. Ipswich and Kaiserslautern did it straight after promotion. Verona and Deportivo did it in leagues dominated by giants. Leicester did it in the richest league in the world, the season after nearly going down. Our rating weighs the pre-season gap: budget, recent finishes, and where available, the odds.