Chido Obi-Martin was Manchester United’s saviour in Hong Kong, netting twice in the second half to help his side recover from another dismal start on their Asia post-season tour.
After a shock 1-0 defeat to the ASEAN All-Stars, United were booed off the pitch and needed a response in their final exhibition game.
Hong Kong stunned Ruben Amorim’s side by taking a 1-0 lead through Juninho before the 20-minute mark, with Tom Heaton beaten at his near post.
In relentless rain and 24-degree heat, United struggled again, showing little fight in the first half.
Jonny Evans started his final game before his contract expires, while the futures of Bruno Fernandes and Alejandro Garnacho remain uncertain amid tensions with Amorim.
Casemiro and youngster Shea Lacy were both withdrawn before half-time, and a furious Amorim made wholesale changes at the break.
The second half brought much-needed energy, particularly from 17-year-old Obi-Martin.
He levelled with a smart turn and left-footed finish before heading home his second in the 82nd minute after a link-up with Mason Mount.
Ayden Heaven added a third late on, nodding in from an Amad cross to seal a flattering 3-1 win for United.
With summer arrivals like Matheus Cunha and rising talents like Obi-Martin pushing through, the pressure is on established names like Rasmus Højlund and Joshua Zirkzee.
Amorim now faces tough decisions as he rebuilds after a turbulent campaign.