Timo Werner scored for the first time in seven Premier League matches as Chelsea earned a vital three points in their quest for Champions League football as they beat 10-man West Ham United 1-0.
West Ham's job was made more difficult when Fabian Balbuena was sent off 10 minutes before the end.
Chelsea and West Ham are both vying for a Champions League spot and with Liverpool dropping points against Newcastle United earlier in the day, a result for either team at the London Stadium became even more important.