Chelsea took a 1-0 lead at the end of first half over 10-man Arsenal. The game turned in the 26th minute when Tammy Abraham pounced on a short backpass from Shkodran Mustafi and was brought down in the box by David Luiz.
The Brazilian was dismissed and the Blues were awarded a penalty that was converted by Jorginho following his slow and stuttered run up as he cooly slots Chelsea into the lead.
Callum Hudson-Odoi came close to doubling his side’s advantage, only to see his effort saved by Bernd Leno.
63 minutes on Martinelli pulled the Gunner back on level terms as he bundles the ball away from a Chelsea corner on the edge of the box and keeps on running.
Kante slips on the half-way line and it allows Martinelli a clear path towards goal. He surges into the box and slots a low effort to the right of Kepa to find the back of the net.
Chelsea regained the lead in the 84th minute as Cesar Azpilicueta diverted Callum Hudson-Odoi’s cross into the net from close range.
Arsenal were not to be denied as they captailised on poor defending from the hosts, which allowed Hector Bellerin to curl home a late equaliser on his first start in six weeks.
Frank Lampard’s Chelsea failed to bounce back to winning ways after suffering an agonising defeat at the hands of Newcastle United last time out.