Chelsea was defeated 3-1 by 10-man West ham on Sunday in an epic English Premier League match.
Chelsea began the match in a slow pace as Nayef Aguerd nodded West Ham ahead in the seventh-minute, taking advantage of James Ward-Prowse’s inch-perfect corner kick.
Carney Chukwuemeka brought Chelsea level before being subbed of as a result of an injury he sustained at the end of the first half.
Enzo Fernandez missed a penalty on the stroke of half-time as Alphonse Areola made an immense save to keep the game level.
Goals from Michail Antonio and Lucas Paqueta sealed win for hosts, who saw Aguerd sent off after he received a second yellow card of the match for a foul on Chelsea forward Jackson.
Chelsea dominated most of the possession in the second half but West Ham showed resilience despite playing half an hour a man short.
Chelsea handed Moises Caicedo his debut after his recent British-record transfer from Brighton just a few days ago.
Caicedo cost Chelsea the third goal as he fouled a West Ham player in the penalty box to give the hosts a chance to extend their lead by two goals.
James Ward-Prowse made his debut for West Ham and made an impressive display by recording two assists in the match before being subbed off in the second half.
West Ham move sixth in the table after their first win of the new campaign, while Chelsea drop to 15th and are still looking for their first win of the season.
Earlier Aston Villa outclassed Everton by four goals to bounce back from a humiliating 5-1 defeat to Newcastle at St James Park.