Park Ji-sung's first-half header in a 1-0 win sent Manchester United two points clear at the Barclays Premier League summit.
The South Korean's effort was enough to secure a deserved victory over Arsenal, who failed to get their reward for handing 20-year-old goalkeeper Wojciech Szczesny his league debut.
In fact, Wayne Rooney wasted a golden chance to ease home nerves when he ballooned a penalty over 17 minutes from time.
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