Premier League, Emirates Stadium: Arsenal 2 (Wilshere 63, Bellerin 90+2) Chelsea 2 (Hazard pen 67, Alonso 83)
Hector Bellerin hit a stoppage-time equaliser as Arsenal held Chelsea to a 2-2 draw after an enthralling encounter at Emirates Stadium.
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The full-back steered home from the edge of the box after Eden Hazard's disputed penalty and Marcos Alonso's sixth league goal of the campaign had seen the visitors come from behind to lead with six minutes to play.
Jack Wilshere had earlier continued his resurgence as part of the Gunners midfield with a rasping opener just past the hour.
It was a sensational final third of a match packed with incident and talking points that had looked like being the tale of two superb goalkeeping displays at the interval.
Alvaro Morata had a night to forget in front of goal as he missed three clear openings while Arsene Wenger was clearly irritated by the award of another debateable penalty when Bellerin was adjudged to have caught Hazard.
Substitute Davide Zappacosta almost won it for Chelsea, but his 93rd minute follow-up came back off the bar.
The result means Chelsea remain third, a point behind second-placed Manchester United. Arsenal stay sixth and are five points adrift of the top four.
Marcos Alonso celebrates for Chelsea against ArsenalGetty Images
Where do you start? A truly exhilarating contest had seen both goalkeepers produce some exceptional saves to keep it goalless up to the hour. Wilshere avoided a second yellow card when he went down too easily before going on to give the Gunners the lead soon after. Hazard's penalty split opinion on social media while Morata's trio of glaring misses were a painful watch. Bellerin then turned from villain to hero when he made amends for conceding the penalty with the well-controlled equaliser, capping a wonderful 90-plus minutes of football. Another great advert for why the Premier League is the most entertaining in the world.
MAN OF THE MATCH
Eden Hazard (Chelsea). A bewitching display from the Chelsea forward. Caused Arsenal problems throughout, but grew as a force in the second period. Earned and converted the penalty to get his side back into it, and showed again why he is rated as one of the best in the world.
Gary Cahill and Eden Hazard celebrate a Chelsea goal against ArsenalGetty Images
ARSENAL: Cech 7, Holding 6, Mustafi 6, Chambers 6, Bellerin 7, Xhaka 6, Wilshere 7, Maitland-Niles 7, Ozil 8, Sanchez 7, Lacazette 7. Subs: Welbeck n/a, Walcott n/a.
CHELSEA: Courtois 8, Cahill 6, Christensen 6, Azpilicueta 7, Moses 6, Kante 6, Bakayoko 6, Alonso 7, Fabregas 8, Hazard 8, Morata 5. Subs: Zappacosta 7, Drinkwater 6, Willian n/a.
Matchcast: Full match stats and commentary
Thibaut Courtois dives for Chelsea against ArsenalGetty Images
14' - CHELSEA CHANCE! Arsenal's defence goes completely AWOL and Morata is allowed to race clean through onto a long ball over the top. The Spaniard has time to pick his spot but somehow contrives to fire well wide with just the keeper to beat.
17' - ARSENAL CHANCE! Maitland-Niles goes down in the Chelsea box. The home crowd screams for a penalty, but it looks like he caught his own heel. Arsenal play on and Sanchez sees a goal-bound strike from close-in tipped onto the woodwork by Courtois. It rolls across the line, hits the other post and is pounced upon by the Blues stopper.
63' - GOAL! Arsenal 0-1 Chelsea. Ozil and Holding combine to tee up Wilshere on the left side of the area, who flashes a rising shot past Courtois at the near post.
67' - GOAL! Arsenal 1-1 Chelsea. Hazard levels from the spot as he coolly fires down the middle with Cech diving to his left. Wenger is fuming on the touchline as he felt Bellerin's challenge on Hazard didn't warrant a penalty.
70' - CHELSEA CHANCE! Morata out-muscles Chambers and rampages towards Cech, but once more he can't find the finish as he fires wide of the near post.
84' - GOAL! Arsenal 1-2 Chelsea. Zappacosta races onto Willian's long pass to the flank. He bamboozles Maitland-Niles and drills in a low cross that Alonso meets first-time to flash beyond Cech.
90+2' - GOAL! Arsenal 2-2 Chelsea. The pressure tells as Alonso's header drops for Bellerin to steer a shot into the far corner from just inside the area. What an incredible match this is!
90+3' - CHELSEA HIT THE BAR! Morata is clear again - but he fires straight at Cech. Zappacosta races onto the rebound but smashes it against the bar!
Jack Wilshere celebrates for Arsenal against ChelseaGetty Images
Wilshere scored his first goal in his last 43 Premier League games, since netting v West Brom in May 2015.
Hazard (63 goals, 37 assists) has been directly involved in 100 goals in 192 Premier League appearances.
Since the start of last season, Marcos Alonso has been directly involved in 16 Premier League goals (12 goals, 4 assists), 4 more than any other defender.
Arsenal have conceded a joint-high 4 penalty goals in the Premier League this season (level with Watford and West Ham).