Manchester United moved to within three points of fourth-placed Chelsea with a smash and grab 2-0 win at Stamford Bridge thanks to goals from Anthony Martial and Harry Maguire on Monday.
Chelsea had two goals disallowed by VAR reviews and were furious Maguire was not sent-off early on for an off-the-ball kick out at Michy Batshuayi.
However, Blues boss Frank Lampard cut a frustrated figure as the flaws in both boxes which have seen his side win just four of their last 14 league games were exposed once more against ordinary opposition.
Victory lifts United up to seventh and within two points of Tottenham in fifth, which could be good enough to qualify for the Champions League next season pending Manchester City's appeal again a two-season ban from European competition.