Javier Hernandez came off the bench to snatch a point for West Ham at Stamford Bridge as Antonio Conte's Chelsea continued their abysmal run of form.
Cesar Azpilicueta prodded Chelsea in front 10 minutes before half-time as he latched onto a loose ball following a corner before stabbing home past Joe Hart.
Javier Hernandez came off the bench to fire West Ham level with 20 minutes to play though. Marko Arnautovic played a speculative ball from the byline which found the Mexican and he rifled a first-time finish past Thibaut Courtois.