JOIN USChampions United battered a depleted Arsenal 8-2 at Old Trafford with Wayne Rooney hitting a hat-trick and rampant City striker Edin Dzeko scored four in a 5-1 away rout of a shell-shocked Spurs.
The Manchester duo stormed to the top of the table with their third wins out of three after Chelsea and Liverpool, now two points back, had hit the summit on Saturday.
In contrast, north London's beleaguered Arsenal and Spurs sit towards the bottom after failing to win in the league this season.
United carved a largely inexperienced Arsenal side apart from the start and it was no surprise when England's Danny Welbeck, who later went off with a hamstring injury, took advantage of poor defending to head in Anderson's scooped pass.
Goalkeeper David De Gea, who has suffered wobbly moments in his fledgling United career, made amends with a penalty save from Robin van Persie midway through the first half, a save that turned out to be the turning point in nthe game, and his smile was broader when Ashley Young curled in a beauty.
Rooney bent home a perfect free kick but De Gea made another slip on halftime when Theo Walcott's shot went in through his legs.
Another delightful Rooney special and a Nani chip followed after the break before Park Ji-sung and Van Persie traded strikes.
Defender Carl Jenkinson became the third Arsenal player in three league matches to be sent off and Rooney completed his treble with a late penalty before winger Young finished off the remarkable rout with another fine goal.