* Champions Man City returned to form with a 5-0 rout of Cardiff
* Sergio Aguero scored on his 300th appearance for Man City
* His 32nd-minute goal was his 205th for the club
* Bernardo Silva and Ilkay Gundogan made it three before halftime
* Riyad Mahrez scored his first two goals for City
* Man City host Brighton next, Cardiff entertain Burnley
CARDIFF CITY 0 MANCHESTER CITY 5
Sept 22 (Reuters) - Sergio Aguero marked his 300th appearance for Manchester City with a familiar landmark goal to set the resurgent Premier League champions on their way to a magnificent 5-0 win at Cardiff City on Saturday.