Barcelona head coach Xavi Hernandez admitted he was surprised by Arsenal's intensity and their tactical fouling as the Gunners defeated the La Liga winners in Los Angeles.
The two European heavyweights met in a pre-season clash while on tour in the US, with the Premier League side defeating their Spanish opponents with a 5-3 win.
Robert Lewandowski and Raphinha put Barcelona in the lead twice, only to be pegged by Mikel Arteta's side thanks to goals from Bukayo Saka and new signing Kai Havertz.
A brace from Leandro Trossard then saw Arsenal take control of the game, and not even Ferran Torres' third could help the Spanish giants, as Fabio Vieira sealed the game for the Gunners with their fifth.