The £50m striker came on as a 57th-minute substitute for Daniel Sturridge and made an immediate impact as he scored with his first touch of the game in Hong Kong.
It is only the second goal the 27-year-old has scored for the London club since moving from Liverpool in January.
The Spaniard had been much maligned for failing to score during his team's pre-season tour of Asia prior to the match.
Speaking before the game, Torres said: "I am 27 years old, don't worry, I don't forget to score goals, I will score.
"It's going to be a big season. My form is okay, it's time to be fit and ready."