Manchester United ended Arsenal's unbeaten start to the English Premier League season as the Gunners self-destructed in their 2-1 defeat at Old Trafford.
Arsene Wenger's side were well on top after taking the lead through Andrey Arshavin's superb strike late in the first half.
But the Premier League champions were handed a lifeline soon after half-time when Arsenal goalkeeper Manuel Almunia needlessly conceded a penalty that Wayne Rooney converted.
It got worse for Arsenal as French midfielder Abou Diaby headed a Ryan Giggs free-kick into his own net five minutes later to give United their third win in four games.
Elsewhere, leaders Chelsea maintained their blistering form with a 3-0 victory over Burnley, while Liverpool came from behind to beat 10-man Bolton 3-2.
Michael Ballack added Chelsea's second goal soon after the break when he headed in Frank Lampard's cross and Ashley Cole smashed in the third five minutes later to give Carlo Ancelotti's team a fourth successive victory under their new Italian manager.
At Bolton, Rafael Benitez's Liverpool showed they have the stomach to fight for the title.
The Reds had made a spluttering start to the campaign, with defeats against Tottenham and Aston Villa raising questions about their ability to win the league for the first time since 1990, twice coming from behind to win 3-2.
Tottenham, in second place on goal difference, kept pace with Chelsea as Aaron Lennon's last-gasp goal sealed a 2-1 victory over Birmingham at White Hart Lane.
Wolverhampton are still waiting for their first home win of the season as Hull ground out a 1-1 draw at Molineux.
Blackburn and West Ham played out a dour goalless draw at Ewood Park.
