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Robin van Persie's controversial penalty helped Manchester United beat Crystal Palace, giving new boss David Moyes a first home league win.

Van Persie slotted in a 45th-minute spot-kick after Kagisho Dikgacoi was adjudged to have fouled Ashley Young.

Dikgacoi was red carded, with Palace unhappy at the decision and arguing the offence took place outside the area.

Marouane Fellaini came on after 62 minutes to make his United debut before Wayne Rooney scored from a free-kick.

Moyes will be relieved at the three points after one Premier League win from his opening three games, while he will also welcome the the scoring return of Rooney ahead of a Champions League group match against Bayer Leverkusen on Tuesday.

However, on the whole, United struggled to break down their stubborn visitors - even when Palace were down to 10 men - in an unconvincing performance.

The Eagles will be left aggrieved by a dubious penalty decision by referee Jon Moss which had such a big bearing on the match.

Palace manager Ian Holloway had to watch from the stands as he served the first of a two-game ban, but his strategy was to contain United and hope to catch them out on the counter-attack.

The gameplan invited pressure, but the visitors slowly becalmed their hosts with a disciplined and organised rearguard.

United had not scored in their previous two league games and, apart from having a long-range Michael Carrick shot saved, they were being frustrated by Palace.

The Old Trafford side also had two penalty shouts turned down, with the first being waved away after Patrice Evra went down after a Mile Jedinak challenge.

Young also went to ground following a Dikgacoi tackle but the United winger was booked instead of being awarded a spot-kick.

As the first half drew to a close, there was a flurry of activity. Van Persie's near-post flick from a low Evra cross went wide before the Dutch striker beautifully controlled a floated Rooney ball and volleyed against the crossbar.

At the other end, Palace forward Dwight Gayle excellently controlled a cross and went past centre-back Rio Ferdinand only to dink his shot wide of onrushing keeper David De Gea.

The main moment of contention in the match then took place when Jedinak gave the ball away to Young, who was clean through on goal before going down as Dikgacoi came across to block him.

The referee pointed to the spot and sent off the Palace midfielder before Van Persie sent keeper Julian Speroni the wrong way from the spot.

Palace felt wronged by the decision but regrouped and continued to show a resilience to limit the damage, although the minor goal threat they had carried had been blunted by the sending off.

United were doing all the attacking and went close when a Young shot was parried by Speroni before a well-struck Fellaini half-volley wide was parried wide.

The Old Trafford side did eventually extend their lead when Rooney curled in a 25-yard free-kick as United extended a run of 12 years unbeaten on home soil against newly promoted teams.