Serie A · Saturday, 22 August 2026. Final score 0–2 (half-time 0–0). Rebuilt from the season as it stood that morning, our rating would have been 47% for over 2.5 goals. This match is older than our frozen ratings ledger, which keeps 30 days, so that figure is a reconstruction from pre-match data rather than a number we published at the time — a distinction worth making, because only the frozen ones prove what we actually said beforehand.
Open this match in the app →| Market | Yes | No | Our call |
|---|---|---|---|
| Over 2.5 goals | 47% | 53% | Under |
| Over 3.5 goals | 21% | 79% | no pick |
| Both teams to score | 48% | 52% | No |
The result model puts Genoa at 25%, the draw at 27% and Napoli at 47%, from expected goals of 0.98 and 1.44.
The league sets the starting point. Serie A has produced over 2.5 goals in 46% of its matches, and that is where a team with no record of its own would sit.
Each side's own record. Genoa have 0 in 0 this season, Napoli 0 in 0. Those records are pulled toward the league rate with the weight of about 24 matches — enough that two or three unusual games cannot swing a rating — giving 46% and 46%.
Last season still counts, briefly. With 0 and 0 games played this season, last season's rates are still blended in and fade out entirely by game 40 — the point at which our testing showed they stop adding accuracy. A single season is part luck, so each club's record is first pulled toward the league average by 34 games' weight. That moves the two figures to 49% and 49%.
The mix. Weighted 40% home side, 40% away side and 20% league — the split that beat every alternative across 30,582 matches of testing — that gives 49%.
Head to head. These sides have met 6 times in three years, producing over 2.5 goals in 83%. That nudges the number 5% of the way toward the head-to-head pattern — deliberately small, because fixtures change more than reputations do — landing on 50%.
Goal expectation. Separately a Poisson model built from attack and defence strength — using real expected-goals data where the league has it — puts this match at 43%, from expected goals of 0.98 for Genoa and 1.44 for Napoli. Folding in 30% of that view gives 48%.
Season opener. One of these sides has not played a league game yet. Openers run about 2.5 points under their league's norm, measured across 2,727 of them, so the rating is docked to 46%.
Calibration. Tested against 97,729 past matches, our ratings below 55% have run consistently too pessimistic — a figure in the high 30s, for instance, has come in about four points higher. So ratings in that range are lifted part-way back, giving 47%.
This breakdown is generated from the same inputs the rating uses, so it cannot describe a calculation we did not perform. The full model is set out in the methodology.
More: Genoa season stats · Napoli season stats · Serie A table and form. Ratings are calibrated probabilities, not tips — a 60% call is expected to miss two times in five.