Alexis Sanchez scored a 98th minute penalty to seal a dramatic victory over Burnley on Sunday at Emirates.
The win saw Arsenal leapfrogging both Liverpool and Tottenham in the table and move up to the second position.
Shkodran Mustafi scored his first goal for Arsenal before Granit Xhaka was sent off by the referee for a double footed foul on Steven Defour.
Burnley equalized in the second minute of injury time as Andre Gray scored from the penalty.
Chelsea also picked up a routine 2-0 win when they met Hull City at home, later on.
Diego Costa and Garry Cahill scored to put Chelsea eight points clear at the top.
Southampton beat Leicester 3-0 at St.Mary’s stadium in the other match of the day.