Crystal Palace condemned Manchester United to a miserable start to their Premier League campaign as Andros Townsend and a Wilfried Zaha double led the Eagles to successive wins at the start of a season for the first time in their history.
After Townsend squeezed a seventh-minute shot into the far corner from Jeffrey Schlupp's cross, the hosts struggled badly but the game slipped away from them thanks to Zaha's controversial 74th-minute penalty.
Referee Martin Atkinson used the VAR TV monitor to decide Victor Lindelof had handled inside his own box. But, after David de Gea thought he had saved Jordan Ayew's spot-kick, Atkinson ordered a retake because the Spain international had moved off his line.