On Sunday, four matches of the sixth round were played in England.
After a challenging match in front of their own fans, Norwich had to admit the superiority of London's Chelsea.
In the 4th minute, Oscar scored the first goal for Jose Mourinho's team, but the home team actively attacked the opponent's goal.
They equalized in the 68th minute when Anthony Pilkington scored with a header against Petr Čech.
Despite the efforts of Chris Hughton's team, they conceded a goal in the 85th minute after a quick Chelsea counterattack.
Then, Eden Hazard scored after a mistake by Alexander Tettey and goalkeeper John Ruddy's insecure performance.
Shortly after, substitute Willian scored with an impressive shot into the far corner of the goal.
In another match, Southampton beat Swansea City 2-0 at home.
The goals for the winners were scored by Adam Lallana and Jay Rodriguez.
West Bromwich Albion, playing at home against Arsenal, played a 1-1 draw.
The hosts took the lead with a goal by Claudio Yacob at the end of the first half, but Jack Wilshere equalized in the second half.
In a surprise result in the capital, Tottenham suffered a heavy defeat of 3-0 against West Ham United in front of their own fans.
Sam Allardyce's team dominated Villa-Boas' team and earned three important points.
The goals for the winners were scored by Winston Reid, Ricardo Vaz Te, and Ravel Morrison.
Arsenal continues to lead the league after six rounds with 16 points, followed by Liverpool with 16 points. Chelsea and Southampton are in third and fourth place, each with 14 points.