West Ham United capitalised on two mistakes from Arsenal's new goalkeeper Petr Cech to claim a surprise 2-0 victory at the Emirates and bring the Gunners' early Premier League optimism down to earth with a bump on Sunday.
Cesc Fabregas and Branislav Ivanovic struck late goals to earn improving champions Chelsea a 2-1 victory at Southampton in the Premier League on Saturday.
Arsenal ended Leicester City's brief stay at the top of the Premier League on Sunday despite being held to a 0-0 draw at Stoke City after Manchester United's Wayne Rooney struck late for a 1-0 win at Liverpool.
Chelsea's woes continued when the holders were dumped out of the Capital One (League) Cup fourth round following a shootout defeat by Stoke City on Tuesday, while Arsenal suffered a humiliating 3-0 defeat at second tier Sheffield Wednesday.
Substitute Dusan Tadic fired the only goal as Southampton recorded a first league win over Manchester United for 27 years on Sunday, climbing above them into third in the Premier League.
Arsenal manager Arsene Wenger announced on Friday that he will step down from his role at the Premier League club at the end of the season after almost 22 years at the helm.
Harry Kane's magical season continued on Saturday as he celebrated his first senior England call-up with his first Premier League hat-trick.
Get the latest from the world of football and more on Rediff.com.