Just when the Portuguese coach probably assumed the team's momentum remained negative, the Red Devils secured the home side's opening Selhurst Park setback in league competition beginning in February.
The Austrian coach's team dominated early rightfully went ahead via their forward's retaken penalty. But they could not to make their dominance count after previously struggling to score against Palace, Amorim's team countered twice in nine minutes via Joshua Zirkzee plus the former Chelsea player.
The match proved disappointing day concluding after multiple matches for the Palace boss, who saw Ismaïla Sarr leave injured with a serious problem in the first period.
His Portuguese counterpart likely maintained his emotions in check as he headed toward the dressing room directly following the game's end.
Amorim had played down similarities regarding the two coaches' game philosophy ahead of the match, though recognizing that the opposition "are just doing things better than us|aspects superior to ours|elements more effectively".
His response to the disappointing loss against 10-man Everton involved altering both wing-backs, featuring the Ivorian occupying the right wing as Diogo Dalot assumed Dorgu's position.
Amorim's team probably recognized an opportunity to profit since they possessed three more days to prepare and almost went ahead inside the opening minute.
A lengthy throw-in generated disorder in the home penalty box however incredibly Dean Henderson produced a point-blank save near the net to stop the Brazilian.
The near miss served as a wake-up call for Glasner's men post the lunchtime beginning that was scheduled by the television schedulers.
Rapidly attempts began to come thick and fast. Following wasted numerous attempts in midweek, it looked could potentially not become Mateta's day after he sent efforts missing the goal during the first quarter.
But in a week when talks over the striker's new deal hit obstacles, it was the France international who provided the first goal.
One more perfect ball by the midfielder enticed the young Frenchman into making contact after recently producing superb interception to stop the winger, the 20-year-old was forced to foul Mateta inside the area.
The goalkeeper returned wearing a cap to shield his eyes from the setting sun but he will be disappointed enabling Amorim's team to draw equal post the break.
Glasner's team was unprepared via a fast United dead ball allowing the forward to control with his chest and swivel in the same movement to produce a shot that flew into the net.
Following weathering a chaotic situation where Zirkzee almost scored again at the wrong end, their afternoon got even better a few minutes later as the Dutch attacker was fouled outside the penalty area by Marc Guéhi.
A temporary uncertainty developed in the defensive wall as the captain passed the set-piece toward Mount enabling the Englishman to score past the keeper with a powerful drive.
Lacking the winger's speed to call on, Palace could barely muster additional opportunities as United were able to complete an important win elevating Manchester United leapfrog the Eagles into sixth place.
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