Primera A · Friday, 30 October 2026 · 01:30. Our rating makes this 50% to go over 2.5 goals, so our lean is under. The Primera A average is 45%.
| Market | Yes | No | Our call |
|---|---|---|---|
| Over 2.5 goals | 50% | 50% | Under |
| Over 3.5 goals | 25% | 75% | no pick |
| Both teams to score | 52% | 48% | Yes |
The result model puts Atletico Nacional at 54%, the draw at 26% and Santa Fe at 20%, from expected goals of 1.61 and 0.87.
The league sets the starting point. Primera A has produced over 2.5 goals in 45% of its matches, and that is where a team with no record of its own would sit.
Each side's own record. Atletico Nacional have 23 in 38 this season (10 of 17 at home), Santa Fe 18 in 37 (7 of 18 away). 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 55% and 47%.
Last season still counts, briefly. With 38 and 37 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 54% and 47%.
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 50%.
Head to head. These sides have met 9 times in three years, producing over 2.5 goals in 67%. 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 45%, from expected goals of 1.61 for Atletico Nacional and 0.87 for Santa Fe. Folding in 30% of that view gives 49%.
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 50%.
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.
| Team | Games | O2.5 | O3.5 | BTTS |
|---|---|---|---|---|
| Atletico Nacional | 38 | 61% | 26% | 45% |
| Santa Fe | 37 | 49% | 27% | 68% |
More: Atletico Nacional season stats · Santa Fe season stats · Primera A table and form. Ratings are calibrated probabilities, not tips — a 60% call is expected to miss two times in five.