Gunners Go Top
David Moyes' tough start to life at Man United manager continued as his side slumped to a third Premier League defeat in six games.
Wayne Rooney continued his rich vein of form, scoring his fifth in five games, to put United on level terms against the Baggies.
But Saido Berahino struck to stun Old Trafford and move West Brom into the top half of the Premier League.
Following that defeat United slump to 13th in the league, six points off the pace at the top of the table.
Yaya Toure and Edin Dzeko both scored for Man City at Aston Villa as Manuel Pellegrini's side look to claim a routine win.
However, late goals from Leandro Bacuna and Andreas Weimann turned the game in Villa's favour.
Man City were left to contemplate a second league defeat of the season while Villa celebrated an unlikely win.
Jose Mourinho and Andre Villas-Boas shake hands ahead of Chelsea's game at Tottenham.
Gylfi Sigurdsson slots home the opener to give Spurs a deserved lead.
Fernando Torres and Jan Vertonghen clash during the game. Torres was later red carded for a clash with Vertonghen.
John Terry celebrates his equaliser as Chelsea secure a point at White Hart Lane.
Southampton moved up to fourth thanks to a 2-0 win against struggling Crystal Palace, with Rickie Lambert scoring the second.
The pressure on Fulham boss Martin Jol intensified as they were beaten by newly promoted Cardiff.
Hull claimed a second successive Premier League win, beating West Ham 1-0 with Robbie Brady scoring his fourth goal of the season.
Arsenal kicked off the evening game knowing they could finish the day as Premier League leaders with a win against Swansea.
Serge Gnabry opened the scoring to calm Arsenal's nerves and continue his progression into the first-team picture.
The ever-reliable Aaron Ramsey continued his astonishing run of goals, nine for the season, to seal the win and send the Gunners top.