Arsenal’s title defence hit an unexpected bump on Saturday as Brighton delivered a comprehensive 3-0 victory at the Amex Stadium. The result ended the Gunners’ 100% record after four league wins and marked their first defeat of the campaign in emphatic fashion.

Mikel Arteta was frank in his assessment afterwards. He highlighted how his side put themselves under pressure from the opening moments, with basic errors compounding quickly against a well-organised Brighton side. The manager described the performance as a “big lesson” for everyone involved, noting the need to improve on technical execution and adherence to core principles under pressure.

Brighton took control early. Pascal Gross opened the scoring with a driven effort from distance after Arsenal failed to clear effectively. Charalampos Kostoulas added a second just before half-time with another low shot that caught the visitors out. Chema Andrés, on his full home debut following a summer move, headed in a third from a corner early in the second half to seal the points.

A familiar foe resurfaces

This was not the first time Brighton have handed Arsenal a heavy defeat. The same scoreline occurred in May 2023, and the Seagulls have often proved awkward opponents for the Gunners in recent years. Fabian Hurzeler’s side entered the match as the Premier League’s top scorers and continued that form with clinical finishing and high turnovers.

Arsenal’s defensive vulnerabilities were exposed throughout. With several centre-backs managing fitness issues, the backline lacked its usual composure. Errors from David Raya’s distribution and poor closing down allowed Brighton space to operate. The third goal from a set-piece only added to the frustration, given Arsenal’s typical strength in that area.

The defeat leaves Arsenal level on points with Manchester City at the top of the table but with a game in hand for the leaders. More importantly, it serves as a timely reminder that even champions cannot afford lapses in concentration against ambitious sides like Brighton, who now sit third after a strong start to their season.

For supporters, the performance raises questions about squad depth and the ability to maintain standards across a long campaign. Arteta has repeatedly stressed the importance of learning from setbacks, and this one provides plenty of material for the international break. The focus will now shift to addressing those early errors before the schedule intensifies again.