Chelsea failed to return to the top of the Premier League as Gylfi Sigurdsson’s penalty ended their 17-match unbeaten run.
Sigurdsson converted his first league goal of the season midway through the first half after Chelsea goalkeeper Edouard Mendy had a rush of blood and ran into Dominic Calvert-Lewin.
Though Chelsea dominated possession, their route to an equaliser was thwarted by England goalkeeper Jordan Pickford who enjoyed a welcome return to form with two brilliant saves to deny Reece James while Mason Mount hit the post with a late free-kick.
After all the hype of being title challengers, it was a sobering evening for Blues boss Frank Lampard who missed the creative influence of Hakim Ziyech and Christian Pulisic as £73million signing Kai Havertz struggled again in his 10th match without a goal.