Luck and Misfortune on Matchday 21: When the xG Gods Rule Arbitrarily

Matchday 21 of La Liga was a feast for all those who still believe in football fairy tales. While some teams converted their chances with surgical precision, others put on a show called "How to turn statistical luck into three points". The result? A matchday that once again proves: In football, what matters in the end isn't what you deserve – but what you get.

Match of the Week: Real Sociedad Against All xG Laws

The clash between Real Sociedad and RC Celta de Vigo at the Estadio Municipal de Anoeta was a statistical marvel of a special kind. The final score of 3-1 for the hosts tells a completely different story than the Expected Goals: The visitors from Vigo actually created better chances (1.97 xG vs. 1.14 xG) and should have left the pitch as winners based on pure performance.

Instead, Real Sociedad could celebrate a victory that was about as likely in the xG world as a penalty goal from Manuel Neuer. With an xG difference of -0.83 in favor of the visitors, this was the perfect example of how football sometimes writes its own laws. Or to put it differently: Sometimes it's better to score three goals with 1.14 xG than to score just one with 1.97 xG.

Lucky Charm of the Matchday: Real Sociedad and Valencia CF Share the Honor

Two teams get to share the title of biggest lucky charm: Both Real Sociedad and Valencia CF turned meager 0.5 Expected Points into full three points – a delta of +2.5 that is statistically about as likely as lightning striking the same tree twice.

Valencia CF showed a particularly creative interpretation of xG statistics at the Estadio de Mestalla against RCD Espanyol. With only 1.21 Expected Goals against the visitors' 1.79, the hosts still won 3-2. That's what you call efficiency – or simply one of those magical football moments where statistics throw their hands up in despair.

xG Victims of the Matchday: RCD Espanyol and RC Celta de Vigo

While some celebrated, others cried – and rightfully so. RCD Espanyol and RC Celta de Vigo shared the sad fate of turning 2.5 Expected Points each into zero real points. Both teams should have gone home with a victory statistically speaking, but instead got to give a masterclass in "How to lose despite better performance".

Particularly bitter for the visitors from Vigo: They created the better chances in San Sebastián but suffered a 1-3 defeat. That's bad luck in its purest form – or as they say in football jargon: "That's football."

Honest League Table: Villarreal CF as Liga Phantom

A look at the honest table reveals perhaps the most curious phenomenon of this season: Villarreal CF officially sits in 3rd place with 51 points, but would rank 13th according to Expected Points with only 27.5 points. A difference of +23.5 points that leaves even experienced xG experts speechless.

On the other side of the spectrum we find Athletic Club, who sit in 8th place with only 34 points but should actually be fighting for Champions League places with 45 Expected Points. The difference between Villarreal and Athletic in the real table is 17 points – in the honest table, Athletic would be 17.5 xP ahead of the Yellow Submarine. That's what you call irony of fate.

Real Betis (+11 points on xP) and Girona FC (+8) also continue to benefit from a luck bonus, while teams like Rayo Vallecano and Valencia CF are underperforming despite decent performances.

Outlook: The xG Laws Strike Back

Statistics are patient, but not forgetful. Teams like Villarreal CF, Real Sociedad and Valencia CF should enjoy their lucky streak – because sooner or later, Expected Goals reality catches up with everyone. Conversely, Athletic Club and RC Celta de Vigo can hope for better times.

Matchday 22 will show whether the xG gods continue to play their whimsical games or finally provide a bit more statistical balance. One thing is certain: In La Liga, anything is currently possible – even the statistically impossible.