Manchester United netted four goals for the second consecutive week in the Premier League to rout Swansea City 4-0 and ensure their highest-scoring start to a season for 110 years.
United manager Jose Mourinho said he "let the horses run freely" at the Liberty Stadium but his old foe Arsene Wenger was left frustrated after Arsenal fell to a 1-nil loss at Stoke City.
Liverpool struggled to squeeze past Crystal Palace 1-0 and promoted Brighton and Hove Albion suffered their second defeat in two games, 2-0 at Leicester City.
Goals flowed at Southampton, who snuffed out an astonishing comeback by 10-man West Ham United to win 3-2.
Watford, who drew with Liverpool last week, beat Bournemouth 2-0 while West Bromwich Albion won 1-0 at Burnley.
The win was Albion's second of the season and put them level on points with leaders Manchester United.