Sergio Aguero's second-half strike gave Manchester City a fourth successive Premier League victory over 10-man Manchester United at Etihad Stadium.

Aguero was twice denied in the first half by David De Gea, before United defender Chris Smalling was sent off.

City then took the lead just after the hour as Aguero fired into the roof of the net from Gael Clichy's pass.

Robin van Persie and Angel di Maria were both denied by Joe Hart as City held firm for the win.

Manuel Pellegrini's side are third, six points behind leaders Chelsea.

No Premier League team has had more players sent off than Manchester United in 2014 (5)

Marcos Rojo was injured for Manchester United, meaning the away side finished the game with a completely different pairing in the centre of defence

Sergio Aguero has scored 11 goals in his last 12 Premier League appearances

Man City have won the last four Manchester derbies in the Premier League - the first time they have won four in a row in the league since 1970