Manchester City returned to the top of the English Premier League football table after a goalless draw with Manchester United, but the much-hyped clash proved far less eventful than the day's other local derby.
Sunderland beat bitter rivals Newcastle United 3-0 to escape the bottom of the table, condemning Aston Villa to 20th place just a couple of hours after they sacked manager Tim Sherwood.
The game changed when Newcastle's captain Fabricio Coloccini was sent off just before half-time, Adam Johnson converting the resulting penalty.
Elsewhere Juergen Klopp was denied a first victory in charge of Liverpool when Sadio Mane scored a late equaliser for Southampton before being sent off in a 1-1 draw at Anfield.
Tottenham Hotspur's Harry Kane retured to goal-scoring form after a lean spell for his club with a hat-trick in the London club's 5-1 romp at Bournemouth.
City have 22 points from 10 games, the same as Arsenal, while United are in fourth place with 20 points.