Athletic Club began their 2025-26 La Liga campaign with a hard-fought 1-0 victory over Rayo Vallecano at San Mamés on August 26, 2025. A solitary goal was enough to separate the sides in a tense and physical opening match of the season for both teams. The only goal came in the first half, a well-worked move finished calmly by one of Athletic's forwards, sending the passionate home crowd into raptures. Rayo Vallecano defended resolutely and created a few chances of their own, but they were unable to find a way past Athletic's determined backline and goalkeeper. The three points provide a perfect start for Athletic Club under the lights at their famous stadium, setting a positive tone for their league objectives. Rayo's manager will take heart from a disciplined performance despite the narrow defeat.