Tottenham claimed pre-season bragging rights over their bitter north London rivals with a 1-0 win in Hong Kong.
Despite both sides creating chances, the looked set to enter the halfway point goalless before a moment of magic from Pape Matar Sarr.
The 22-year-old netted a stunning effort from 45 yards to catch David Raya off his line and put Thomas Frank's side into the lead on the brink of half time.
The Gunners pushed for an equaliser following the restart but even the first glimpse of Viktor Gyokeres in an Arsenal shirt following his high-profile move wasn't enough to get them back into the game.