Manchester United did just enough to leave Wolves with a hard fought 1-0 at Molineux.
Ole Gunnar Solskjaer's side were second-best to a lively Wolves for long periods before Mason Greenwood scored a contentious late winner.
Wolves felt Ruben Neves was fouled in the build-up but the goal was allowed to stand.
Wolves could have been 3-0 up inside 15 minutes, with Raul Jimenez forcing David de Gea into an early save, Aaron Wan-Bissaka making a goal-saving block to deny Trincao and Joao Moutinho volleying over after a mistake by Jadon Sancho.
United were second best for long periods and it required a spectacular double save by De Gea from Romain Saiss to prevent Wolves from taking the lead before Greenwood's finish.
Solskjaer said of Greenwood's goal: "It's special. To get the shot on target from that angle is good, of course the keeper maybe could have saved it but he hit it so quickly. The beauty of him is that he can go outside right foot and inside left foot, so it's hard for a defender."
On new signing Raphael Varane, he added: "He was class. Composed, experienced, good on the ball, in the air. He's got everything as a centre-back so I'm delighted with his performance."
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