Arsenal suffered a late collapse as Chelsea came from behind to claim a dramatic 2-1 win in Mikel Arteta's first home game in charge of the Gunners
Arsenal seemed to be on course for victory at the Emirates Stadium as they went into the closing stages a goal up thanks to Pierre-Emerick Aubameyang's early header, but a glaring error from Bernd Leno allowed Jorginho to equalise from Mason Mount's free kick in the 83rd minute
Then, three minutes from time, Arsenal were caught on the counter-attack, with Tammy Abraham converting from Willian's cut-back to complete a remarkable turnaround in front of the stunned home fans
It was a crushing outcome for the Gunners, who were outstanding for the opening half-hour before Chelsea fought their way back into the game, clinching a late victory which consolidates their position in the top four and leaves Arteta to wait for his first win as head coach
Arsenal overwhelmed Chelsea in the opening stages, with Aubameyang and Alexandre Lacazette setting the tone by ferociously pressing the visitors high up the pitch as Reiss Nelson tormented Emerson on the right flank and David Luiz tested Kepa Arrizabalaga with an early free kick
There was one early scare for the hosts at the other end when Leno - his vision impaired by the sun - was forced into a scrambling save by Mount, but within a few minutes of that Chelsea chance, Arsenal had the lead their electrifying start deserved
Mesut Ozil's corner was flicked on by Calum Chambers at the near post, and Aubameyang was alive in Chelsea's six-yard box, escaping Emerson to head beyond Arrizabalaga for his 12th Premier League goal of the season
Arsenal continued to rip into their opponents after that, with the reinvigorated Ozil picking their defence apart and combining beautifully with Aubameyang, Lacazette and Nelson, whose speed and directness left Chelsea with little choice but to foul them repeatedly
The hosts lost Chambers to an injury midway through the half, with Shkodran Mustafi replacing him, but their dominance continued, prompting Lampard to make an early change, hauling off Emerson for Jorginho in the 34th minute and abandoning Chelsea's back three
Jorginho gave Chelsea greater control in midfield, but Arsenal's compact defensive shape made them difficult to break down and they continued to threaten on the break, too, with Aubameyang sending one diagonal shot into the side netting from a Bukayo Saka pass shortly before half-time
Chelsea looked far more threatening after the break, however, with N'Golo Kante sending an early effort narrowly wide and Leno almost landing Arsenal in trouble with a loose pass in his own half soon after that
Arsenal's defensive resolve was epitomised by Luiz when he produced an outstanding last-ditch block to deny Abraham after he had been played through on goal by teenage substitute Tariq Lamptey, who had been thrown on for his debut
Arsenal substitute Joe Willock then fired narrowly wide at the other end, but not long after that the Emirates Stadium was stunned into silence when Leno misjudged the flight of Mount's free kick, allowing Jorginho - who had been fortunate to avoid a second yellow card earlier in the half - to finish into an empty net from three yards out
The Gunners poured forward in search of a winner, but instead they were caught out on the break, with Willian cutting the ball back for Abraham, who kept his composure to score his 12th Premier League goal of the season and prompt wild celebrations in front of the away end
Abraham went close to adding a third in the closing stages, with Lucas Torreira sending Arsenal's best chance wide, but there were no further goals, leaving Arteta to rue a costly collapse as Lampard joined his players to celebrate on the pitch at full time
Arsenal host Manchester United on New Year's Day at 8pm, while Chelsea travel to Brighton in the 12
30pm kick-off on the same day
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