Barcelona Demolish Valencia, Inter Stage Comeback, Arsenal Beat Chelsea

Barcelona announced themselves on the road with a 5-0 dismantling of Valencia at Mestalla — a scoreline that left Hansi Flick, remarkably, still searching for more from his side. It was the kind of performance that sets a tone, and Barcelona look like a team with serious intent this season.

In Serie A, Inter produced the drama of the day, overturning a 2-0 deficit to beat Napoli 3-2 at San Siro, Lautaro Martinez poking home the winner in a finish that sparked scenes of real joy on the terraces. The news was tempered slightly by a mild knee sprain to Federico Dimarco, who now faces a race to be fit for the visit of Real Madrid. In England, Arsenal showed character of their own, coming from behind to beat Chelsea 2-1 in a London derby at the Emirates, with Martin Odegaard pulling the strings throughout.

Across the day's other threads: 16-year-old Cavan Sullivan broke Freddy Adu's long-standing MLS scoring record for Philadelphia Union, the WSL season began with Arsenal, Tottenham and Manchester City all winning, and Gianni Infantino confirmed he will stand for re-election as FIFA president next March.