Gylfi Sigurdsson penalty ends Chelsea’s unbeaten run

Goalkeeper Mendy's error costs Frank Lampard's side

Gylfi Sigurdsson (centre) celebrates scoring from the spot (Jon Super/PA)

Premier League: Everton 1 Chelsea 0

Chelsea’s 17-match unbeaten run was ended by an Edouard Mendy error at Goodison Park as a patched-up Everton side won 1-0 to deny their visitors the chance of going top of the table.