Bottom line: Osasuna's defense is conceding 5.1 goals more than expected, making them La Liga's most defensively cursed team this season.
Through October 21, 2026, La Liga is deep enough into the campaign that expected goals against data, per FBref, starts telling us something real. The defensive luck signal measures the gap between goals a team has actually conceded and their xGA - the quality-adjusted total of chances they've given up. A team conceding far more than their xGA suggests a defense getting punished by finishing quality beyond its control. A team conceding far fewer is riding a wave of opponent wastefulness that probably won't last. Neither side of the ledger is comfortable forever.
This is not about who defends well or poorly. It's about who is getting results their underlying numbers don't support.
Most Cursed by Defensive Luck
| Rank | Team | Goals Conceded | xGA | Difference |
|---|---|---|---|---|
| 1 | Osasuna | 18 | 12.9 | +5.1 |
| 2 | Racing Santander | 25 | 20.9 | +4.1 |
| 3 | Rayo Vallecano | 17 | 13.0 | +4.0 |
| 4 | Sevilla | 16 | 13.1 | +2.9 |
| 5 | Malaga | 18 | 15.2 | +2.8 |
1. Osasuna have conceded 18 goals against an xGA of 12.9, a gap of +5.1. Their opponents are finishing at a rate that would make any striker blush. The defensive structure isn't as broken as the goals column suggests. 2. Racing Santander sit at 25 conceded versus 20.9 xGA (+4.1). Those are big raw numbers either way, but they're being punished beyond what the chances merit, which is cold comfort when you're a promoted side. 3. Rayo Vallecano have allowed 17 goals against 13.0 xGA (+4.0). Vallecas has seen some clinical finishing from visitors this autumn. 4. Sevilla at 16 conceded versus 13.1 xGA (+2.9) are in that familiar territory of a squad whose table position looks slightly worse than it should. 5. Malaga, conceding 18 against 15.2 xGA (+2.8), round out the cursed five. Not a dramatic gap, but persistent enough to notice.
Most Blessed by Defensive Luck
| Rank | Team | Goals Conceded | xGA | Difference |
|---|---|---|---|---|
| 1 | Real Betis | 14 | 18.0 | -4.0 |
| 2 | Celta Vigo | 7 | 10.7 | -3.7 |
| 3 | Athletic Club | 6 | 8.7 | -2.7 |
| 4 | Getafe | 11 | 13.4 | -2.4 |
| 5 | Alaves | 10 | 11.0 | -1.0 |
1. Real Betis have conceded 14 goals against 18.0 xGA (-4.0). Opponents are squandering chances at an unsustainable clip. Enjoy it while it lasts. 2. Celta Vigo sit at a tidy 7 conceded versus 10.7 xGA (-3.7). That defensive record looks elite. The xGA says it's merely decent. 3. Athletic Club with 6 conceded against 8.7 xGA (-2.7) are genuinely good defensively, and also genuinely fortunate. The combination flatters beautifully. 4. Getafe at 11 conceded versus 13.4 xGA (-2.4) are doing what Getafe do - making life miserable for opponents - but the margins are tighter than they appear. 5. Alaves round things out at 10 conceded versus 11.0 xGA (-1.0). A modest blessing, barely a whisper from the football gods.
What This Tells Us
The full range here spans 9.1 goals of variance, from Osasuna's +5.1 to Betis's -4.0. Historically, defensive luck signals regress substantially across a full season. Goalkeepers don't perpetually overperform or underperform post-shot xG, and opposing forwards don't stay scorching hot or ice cold indefinitely. Osasuna's underlying defensive work is closer to midtable than their goals conceded column implies. Betis's defensive record is closer to concerning than their clean sheet count suggests.
The data doesn't lie. It just takes its time telling the truth.
