Traditional save percentage fails to differentiate between a routine rolling shot and a 90mph strike into the top corner. Post-Shot Expected Goals (PSxG) measures shot quality after contact, quantifying true goals saved.
Evaluate goalkeeper performance against the quality of shots on target faced.
Pre-shot xG measures chance quality at the moment of the shot. Post-shot xG measures where the ball actually goes. A wild shot into row Z has a high pre-shot xG, but 0.00 PSxG.
The definitive shot-stopping metric. Positive figures indicate a goalkeeper saving their team points; negative values highlight costly goalkeeping errors.
Percentage of crosses into the penalty area intercepted by the goalkeeper coming off their line, relieving immense pressure from central defenders.
Defensive actions outside the penalty area per 90 minutes. Vital for high-line systems (Guardiola, Flick) to sweep long counter-attacking balls.
Because penalty strikes on target are taken from 12 yards with immense speed, give goalkeepers minimal reaction time, and result in goals roughly 79% of the time when on target.
Thibaut Courtois during Real Madrid's 2022 Champions League campaign (+9.8 PSxG in European knockout games alone) and Alisson Becker across Premier League seasons consistently record top-tier positive differentials.
Yes. If a shot takes a massive deflection, modern data models recalculate the trajectory from the deflection point, accurately evaluating the impossible reaction task for the goalkeeper.