Arsenal increased the pressure on Sunderland manager David Moyes with a comfortable victory over a Black Cats side who remain bottom of the table and without a Premier League win this season. Manchester United had manager Jose Mourinho and midfielder Ander Herrera sent off as they failed to break down Burnley and lost more ground on the pacesetters at the top of the Premier League. A brilliant solo goal from Gastón Ramírez helped Middlesbrough to a first win in eight Premier League games as they beat Bournemouth at the Riverside Stadium.