Manchester City supporters ended a bad week by finding old enemy Manchester United closing to within two points of them at the top of the Premier League after a 3-2 victory at Southampton on Sunday.A week ago City were five points clear of their neighbours, having not even conceded a goal in five matches, and the bookmakers were slashing their title odds.Then after a hugely disappointing home defeat by Juventus in the Champions League, they were shocked by West Ham United’s 2-1 victory at the Etihad that ended a 100 percent league record.United rubbed salt into east Manchester wounds when they resisted Southampton’s late rally thanks to some fine saves from goalkeeper David de Gea, who had seemed certain to leave in the recent transfer window.Instead a deal with Real Madrid broke down on the last day of the window, when United also brought in Anthony Martial from AS Monaco as the world’s most expensive teenage signing at 36.3 million pounds ($56.39 million).Having scored as a substitute on his Premier League debut against Liverpool, he added two more goals at Southampton, both expertly taken.Graziano Pelle put Southampton ahead in the 13th minute. Martial equalised 10 minutes…