Schoolboy Bukayo Saka scored the winner as Arsenal U19s got their Dallas Cup campaign off to an excellent start with a 2-1 victory over the hosts.
Folarin Balogun gave Arsenal the lead before a fine strike from Jorge Almaguer saw FC Dallas pull level.
It was Saka, however, who would make the decisive contribution against the holders, with Arsenal now full of confidence going into their remaining group games against Queretaro and Red Bull Brasil.
Subs: Clarke (for Olowu, 59), Swanson (for Coyle, 59), Spencer-Adams (for Daley-Campbell, 71), Beckford (for Benson, 79). Not used: Barden, Burton, Dennis, McGuinness, Thompson.