Peterborough United began their English Football League One campaign with a 2-0 home defeat to Luton Town on August 9, 2025. Two second-half goals from the visitors secured a comfortable opening-day victory at London Road Stadium. The first half was a cagey affair, with both teams probing for an opening. Luton Town grew into the game after the interval and broke the deadlock with a well-worked team move. They doubled their lead shortly afterwards from a set-piece, leaving Peterborough with a mountain to climb. The home side struggled to create clear chances against a disciplined Luton defense, resulting in a disappointing start to the season for Posh.