Pep Guardiola may have thought it a bad day when he suffered a fifth match without a win on Sunday but it was nothing compared to the nightmare that befell his old managerial rival Jose Mourinho on an extraordinary afternoon of Premier League action.

Guardiola¡¯s Manchester City went back to the top of the table on goal difference after a 1-1 draw at home to Southampton, leaving him to reflect glumly on a five-game winless streak for only the second time in his garlanded career.

A couple of hours later, though, his Manchester United rival Mourinho, a general not used to humiliation, was forced to sit at a ground he once commanded and see his side ripped apart 4-0 as Chelsea produced one of the standout displays of the season at Stamford Bridge.