Rayo VallecanovsAthletic Bilbao

Round 8 of La Liga brings Athletic Bilbao to Vallecas, with both sides assessed from a 2025-26 table baseline because the current season's sample is still too small. The number that frames this fixture is Rayo Vallecano's defence, ranked fourth in the league last season, against a model that gives them a 48.2% win probability.

Rayo finished eighth in 2025-26 with 50 points from 12 wins, 14 draws and 12 losses, scoring 41 and conceding 44. The split explains the ranking: their defence was fourth-best in the division while their attack ranked 17th of 20, at 1.08 goals per game. Their last five league fixtures read DWLWL, averaging 1.8 scored and 2.6 conceded.

Athletic Bilbao ended 2025-26 in 12th on 45 points, with a minus-15 goal difference from 43 scored and 58 conceded. Neither end ranked inside the top half: 15th for attack, 16th for defence, at 1.13 scored and 1.53 conceded per game. Their most recent five read DDWWL, averaging 1.2 scored and 0.6 conceded.

Four meetings are on record and Athletic have won three of them, with one draw; Rayo have taken a single point from the series. The goals read 7-3 to Athletic, an average of 2.5 per meeting, and two of the four produced two goals or fewer. Four matches is a thin sample to lean on heavily.

Rayo's home record is the strongest part of their profile: nine wins, nine draws and two defeats in the last 20 at Vallecas, with 1.4 scored and 0.85 conceded per game — better at both ends than their overall 1.08 and 1.16. Athletic's away numbers move the other way defensively, at 1.75 conceded per away game against 1.53 overall, though they score more on the road: 1.5 versus 1.13.

Both clubs last played on 19 September, a 21-day gap that is identical for each side. Both have also faced demanding recent schedules — Rayo's last four opponents averaged a rank of 7.8, Athletic's last five an average of 8.0, where a lower number means a tougher opponent. Neither side carries a promoted-team adjustment.

The Poisson model rates this with high confidence: Rayo 48.2%, draw 27.1%, Athletic 24.7%. It projects 1-0, from expected values of 1.41 and 0.92, and lists 1-0 (13.7%), 1-1 (12.6%) and 0-0 (9.7%) as the likeliest exact scorelines. Combined goals project at 2.33, with a 67.6% chance of two or more and 45.5% for both teams scoring. The margin looks tight: a one-goal home win at 24.7%, two or more at 23.5%, the draw at 27.1%.

The 2025-26 table, the home and away splits and the model all point to a narrow Rayo Vallecano win, built on a home defence conceding 0.85 per game against an Athletic side that conceded 1.75 per away match. The clearest way that fails is if Rayo's last-five rate of 2.6 conceded per game is the better guide to this fixture. Athletic's 1.5 goals per away game is the supporting case.