Arsenal stormed back to the top of the Premier League with a fine return to form against beleaguered London rivals Chelsea.
Having not won any of their past four games, the Gunners eased to a 3-1 victory to leapfrog Manchester City for at least the next 24 hours.
Captain Martin Odegaard hit a brace as Gabriel Jesus wrapped up the points before the interval, with Chelsea slipping to a sixth successive defeat under interim boss Frank Lampard.
Recalled Noni Madueke at least hit a rare consolation goal for the Blues, who have now lost six of their past seven meetings with Arsenal.
While it was a night to remember for skipper Odegaard, it was one his predecessor will want to forgot in a hurry, Pierre-Emerick Aubameyang starting for Chelsea for the first time since facing Arsenal on November 6 but lasting just 45 minutes before being substituted.
Arsenal boss Mikel Arteta had refused to rule his side out of the title race despite a four-game winless run which culminated in a galling defeat to rivals City last week.
This result takes them back to the summit, two points clear of City but having played two games more and with Pep Guardiola’s men in fine form ahead of their visit of West Ham on Wednesday.
Granit Xhaka had an early chance but his close-range strike was saved by the legs of Kepa Arrizabalaga, who was in for a busy night.
It was a lively start for the hosts, with Bukayo Saka next to test Kepa, the England forward’s header palmed away by the Chelsea goalkeeper.
There was nothing the stopper could do shortly afterwards, however, only getting a glove to a fine Odegaard finish from a Xhaka cross with both players afforded the time and space to put Arsenal into a deserved lead.
The same pair combined again for the second, again with little to no pressure on either player as Odegaard drifted away from Raheem Sterling to net a 14th goal of the season.
Chelsea almost hit back through Ben Chilwell but his England colleague Aaron Ramsdale pushed his shot behind at full stretch.
Lampard reacted to an abject first half by replacing the ineffectual Aubameyang, who had just nine touches on his Emirates return – four of which were kick-offs.
It was Arsenal, though, who continued where they left off, Gabriel Magalhaes heading a corner towards goal where his fellow Brazilian Thiago Silva controlled on the line before coolly clearing under pressure.
Xhaka nearly went from provider to scorer but Kepa pushed his strike away before Jesus could not keep an effort down with Arsenal rampant.
Chelsea would pull a goal back, just their second in eight games, as Madueke bundled home his first Premier League goal after skipping inside Oleksandr Zinchenko.
Mykhailo Mudryk, strongly linked with Arsenal before his January move to Chelsea, was introduced by the visitors six minutes later. He had a laser pen shone at him on several occasions but saw plenty of the ball as he sought to make the closing stages nervy for the Gunners.
However, unlike in recent weeks when Arteta’s defence has creaked under pressure, they stood firm to see out the game and secure a vital win.
Emery has no complaints after tired Aston Villa lose late on at Brighton
Unai Emery accepts Aston Villa can have no complaints over their 1-0 loss to Brighton and Hove Albion in the Premier League.
The Villans fell to a narrow defeat at the Amex Stadium on Sunday as Joao Pedro converted late on after his initial penalty attempt was saved.
Villa looked sluggish throughout yet were just minutes away from claiming a point that would have further boosted their top-four prospects.
John McGinn also had a goal ruled out for a marginal offside, but Emery admits his side were not deserving of a point on their travels.
"We competed but it was not enough," he told BBC Sport. "We weren't strong enough in 90 minutes to deserve anything more than we achieved.
"Now the most important thing is to rest, to rest today, rest tomorrow, after the match.
"We are having an amazing season, brilliant, but of course we are at the last chance and we have to try and give everything."
Villa remain seven points clear of fifth-place Tottenham, albeit having played a game more, after Spurs' 4-2 loss at Liverpool.
Before focus can turn to the Villans' home match with Liverpool in a week's time, they first travel to Olympiacos for their Europa Conference League semi-final second leg.
Emery's men have a major task on their hands if they are to reach the final as they trail 4-2 from last week's first leg at Villa Park.
"We want to put in a good effort on Thursday [against Olympiakos] and on Monday against Liverpool. Now is time to rest," Emery added.
"We had a lot of players injured and they are recovering. The most important thing is to get players back for balance and to be competitive."
Victory for Brighton was much needed after going six without a win in the Premier League, failing to score in four of those matches.
While Roberto De Zerbi was pleased to get back to winning ways, he accepts Brighton were given a helping hand by Villa's quick turnaround in games.
"To be honest, Villa were not themselves, maybe a little tired," he said. "They are playing in the Europa Conference League and they have a lot of injuries.
"I am proud because we played a great game against one of the best teams in the Premier League. Playing against Unai Emery's teams is very tough.
"We played well, we deserved to win and we could have scored more goals. I think Robin Olsen was the best player for Villa."
Declan Rice loss to blame for heavy West Ham defeats - David Moyes
Declan Rice's absence is to blame for a number of heavy West Ham defeats this season, according to manager David Moyes.
West Ham sold captain and influential midfielder Rice to Arsenal last July for a club-record fee rising to £105million with add-ons.
The Hammers have seen results nosedive since the turn of the year, most recently crashing to a 5-0 defeat away at Chelsea on Sunday.
That was the sixth time West Ham have conceded four or more goals away from home this season, and their fifth loss in six away games overall.
Asked at his post-match press conference exactly why his side are on the end of heavy losses so frequently of late, Moyes said: "Declan Rice."
The Scotsman, due to be out of contract next month, added: "You get the best midfield player in the country, protecting, making sure the moments and times you limit maybe 50 per cent of the attacks.
"It makes you a much better defensive team when you get that. We've lacked protection in front of the back four; we've lacked good enough defending; we've not been good enough on those things in many games.
"You've got to be careful. You're talking about a team sitting in a really, really strong position. We've had a couple of bad days away from home, which we have to try and eradicate and make better.
"I'm trying to put a bit of mental toughness when we need it. The teams I normally prepare would normally have it. You could always lose the way you lose."
West Ham have won just one of their past nine Premier League games, seeing them slip down to ninth place and now out of the top-six running.
United have also failed to keep a clean sheet in any of their past 16 in the competition - only the second time they have done so in a single Premier League season.
The poor run of form, which also includes elimination from the Europa League at the hands of a strong Bayer Leverkusen side, has raised doubts over Moyes' future at London Stadium.
Amid suggestions that former Real Madrid and Spain boss Julen Lopetegui has already been lined up, Moyes reiterated he will wait until after the season to hold talks over his future.
"I'm going to talk to the board at the end of the season, so we’ll do that then," he said.
Postecoglou: Spurs have a confidence problem to overcome
Ange Postecoglou says that Tottenham need to "overcome" their low confidence after suffering a 4-2 defeat to Liverpool on Sunday.
Spurs slipped to their fourth consecutive Premier League defeat, being left to bemoan their slow start as they found themselves 4-0 down by the hour mark thanks to goals from Mohamed Salah, Andrew Robertson, Cody Gakpo and Harvey Elliott.
Richarlison came off the bench to salvage some pride for Spurs, scoring one before setting up Son Heung-min for a goal on his 300th Premier League appearance.
Spurs had the opportunity to cut the gap to the top four after Aston Villa’s defeat to Brighton, but they remain seven points off a Champions League spot.
Postecoglou’s side still have a game in hand over the Villans, though he was sure that Spurs would be able to put their recent poor run behind them.
Asked if Spurs had a confidence problem, Postecoglou told Sky Sports: "Maybe in the front third there is.
"It probably is a bit of a lack of confidence, but again, that's something the guys have to work through.
"You have to find a way to overcome that because, ultimately, if you don't put pressure on the opposition in the front third after you've worked your way up there, they're going to get comfortable with their position."
Spurs have won just one of their last nine Premier League away games, failing to win any of the last five.
Despite that run extending at Anfield, Postecoglou highlighted what he thought was an improvement on their recent performances.
He continued: "Obviously a hugely disappointing outcome for us but at least we were more like ourselves today in terms of our football.
"Our last two away games at Newcastle and Chelsea, apart from the results which weren't great either, we just didn't try and play our football.
"I thought today, even in the first half, some of our football, our pressing was back to where it should be."
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