Chelsea’s 100 per cent record in the Premier League was ended by West Ham United in a 0-0 draw on Super Sunday, reports Sky Sports.
After winning their first five games under Maurizio Sarri, Chelsea's quality in the final third was severely lacking as Eden Hazard was suffocated by the Hammers' midfield.
West Ham created clear chances but missed the ruthlessness of Marko Arnautovic, who was absent with a knee injury.
The standout opportunity fell to Andriy Yarmolenko late on but he headed wide from six yards out.
Despite bossing the ball in the early stages, Chelsea - who had made a midweek trip to Greece in the Europa League - created little as West Ham carried the bigger threat on the counter attack.
David Luiz headed a great opportunity over the bar just after the break as Chelsea continued to look pretty with the ball but lacked ideas in the final third, with the axis of Hazard, Olivier Giroud and Willian struggling to find much rhythm.
Alvaro Morata replaced Giroud on 64 minutes and should have scored within two minutes of coming on.
Hazard should have been greedier when bursting into the box with 15 minutes left, deciding to look for Morata rather than shoot before Yarmolenko wasted a glorious opening.
Ross Barkley tested Fabianski from range in stoppage time and Willian fired wide from a tight angle but a Chelsea winner never really looked likely as they failed to score in the Premier League for the first time under Sarri.
Marco Silva expressed frustration and bemusement at the Pierre-Emerick Aubameyang goal that sank Everton and gave Arsenal a 2-0 win at Emirates Stadium.
Aubameyang was a full yard offside when he converted from Aaron Ramsey’s flick to build on the lead that Alexandre Lacazette had just given Arsenal on 56 minutes and there would be no way back for Everton.
Everton had created a fistful of good chances in the first half only to run into Petr Cech in inspired form. Even at 2-0, he continued to deny Silva’s men.