Chelsea’s 3-0 Premier League win over West Ham was like a pre-season stroll at times but there were flashpoints. Ahead of West Ham’s clash with Chelsea at the London Stadium Hammers News highlighted that it is one of the most underrated rivalries in English football. But West Ham’s players didn’t get the memo as they turned in an insipid display to lose to Chelsea. Julen Lopetegui got his tactics all wrong as the Hammers were beaten comfortably. West Ham fans booed the team off, jeered the manager’s substitutions and thousands walked out en masse with 20 minutes to go. One of the biggest frust…