Our model makes Athletic Club the clear favourite here, giving the Home win a 48.4% probability, comfortably above both the draw at 26.2% and the away win at 25.4%. Playing at San Mamés is a big edge: Athletic were one of La Liga’s stronger home sides last season, finishing slightly above Sevilla in the table with 45 points to Sevilla’s 43, and building that total on solid results in Bilbao. Recent head‑to‑head also leans their way: across the last five clashes in La Liga, Athletic took three wins (2–0 at home in May 2024, 2–0 away in January 2024, 0–1 away in March 2025), with one draw (1–1 in September 2024) and only one Sevilla victory (0–1 at San Mamés in April 2023). That pattern shows Athletic have learned how to control this matchup. Sevilla, by contrast, have struggled for consistency away from home and finished the previous campaign just behind Athletic in the standings, highlighting a small but real gap in level and stability. The bookmakers’ prices back this view, with several firms quoting the home win around 1.70, implying roughly a 58–59% chance; our model is more conservative but still sees Athletic on top. With home crowd energy on opening weekend, a solid defensive base, and recent positive results in this fixture, a narrow but deserved home win looks the most likely outcome.

Our model points to an open game, giving Yes in the Both Teams To Score market a 51.9% probability versus 48.1% for No, so it slightly favours goals at both ends. The recent head‑to‑head supports a balanced picture: in the last five league meetings, BTTS landed in two matches (3–2 Athletic win in 2025, 1–1 draw in 2024) and failed in three others that finished with clean sheets, which shows this fixture can swing either way but has enough attacking quality on both sides. Athletic arrive with a confident attack after a strong 2025‑26 campaign in the top half, regularly finding the net at home, while Sevilla, even in a more uneven season, still produced a decent goal tally and rely on quick transitions and set pieces to create chances. Tactical trends also push toward BTTS: Athletic under Valverde tend to press high at San Mamés, leaving space behind, while Sevilla are unlikely to sit too deep, needing points early to avoid another mid‑table struggle. The market leans slightly the other way, pricing BTTS Yes around 2.05 and No near 1.70, implying bookmakers see a greater chance of one side failing to score. Our model, however, nudges the probability above 50%, and when you combine that with both teams’ attacking profiles and the typical high‑tempo feel of an opening‑week game, expecting at least one goal from each side is a reasonable call.

Despite a slight lean toward Both Teams To Score, our model still favours a relatively tight contest on the scoreboard, giving Under 2.5 goals a 52.1% probability compared with 47.9% for Over 2.5. Recent history between these sides backs a cagey outlook: in the last five league meetings, four stayed under this line (2–0 Athletic in May 2024, 2–0 Athletic in January 2024, 0–2 Athletic win away in early 2024, and 0–1 Sevilla in April 2023), with only the 3–2 Athletic home win in 2025 going over. Both clubs have tended to build from a strong defensive shape, especially in bigger league fixtures, and Athletic at San Mamés often control territory and tempo without turning matches into high‑scoring shootouts. Last season’s full‑table stats show neither side among La Liga’s most explosive attacks, with goal differences that suggest balanced, mid‑scoring games rather than wild scorelines. The odds market supports a cautious view on goals: Under 2.5 is widely offered near 1.65, while Over 2.5 sits closer to 2.15, implying bookmakers see a clear edge for a match with at most two goals. Combining our model’s slight preference for the under, the historic trend of low‑scoring meetings, and both managers’ likely approach in an early‑season fixture, a 1–0 or 2–0 home win, or even a 1–1 draw, fits well with Under 2.5 landing.