Calum Chambers' stoppage-time header cost Manchester United their 100% pre-season record under new manager Erik ten Hag as Aston Villa came back from two goals down to end their own tour of Australia unbeaten at a rain-sodden Optus Stadium in Perth.
Chambers rose unchallenged to nod home a rather soft second that will give Ten Hag something to ponder on his side's return to Manchester.
Jadon Sancho's third goal of the trip had given United an early lead and when Villa's Matty Cash turned a Marcus Rashford effort beyond the reach of his own keeper Emi Martinez, it seemed victory was secure.