Mikel Arteta and Arsenal now face a thorough examination of their mentality and focus after Thursday's morale-sapping 3-0 north London derby defeat blew the race for fourth wide open.
While the importance of Champions League qualification might feel exaggerated to some given the financial muscle of practically every Premier League club, regardless of finishing in the top four or not, the end of 2021-22 will undoubtedly have significant implications for both clubs.
A top-four finish would be Arsenal's best Premier League season in six years and simultaneously the first time since the same season that they'd finished above their bitter rivals.
Champions League qualification would also be vindication of the faith placed in Arteta and a clear sign of genuine progress since he replaced Unai Emery.
For Spurs, on the other hand, it's difficult to look at these final 10 days of the season being anything other than a sliding-doors moment.
Failure to return to European football's top table would plausibly see Antonio Conte call it quits, whereas the possibilities could be endless under him with the extra cash, exposure and lure provided by the Champions League, particularly when you consider the transformational effect he's already had in north London and elsewhere previously.
With those points in mind, it was no surprise to see Thursday's contest – the first with fans present at the Tottenham Hotspur Stadium – labelled the most important north London derby in Premier League history, and it's fair to say the hosts handled the occasion far better than the Gunners.
Perhaps that wasn't actually as shocking as it initially felt during the match.
The turning point came with just 33 minutes on the clock. While Tottenham were already ahead thanks to a Harry Kane penalty, it was just past the half-hour mark when Rob Holding's pushed his luck once too often.
Having already been booked – frankly, he could have been carded several times by this point – Holding cynically blocked off the relentless Son Heung-min with a combination of shoulder and elbow, deservedly earning himself a second yellow and subsequent red card.
It had been coming. Holding's early duels with Son had the South Korean showing signs of frustration – not because he couldn't get the better of his opponent, but because he was getting the better of him. He just kept getting fouled by the Arsenal defender.
Holding's wry smile when walking away from an angry Son after a tangle that wouldn't have looked out of place on a Judo mat belied a degree of arrogance and misplaced confidence.
It was ill-judged to say the least.
But of course, this is by no means the first time indiscipline's been seen as the scourge of Arsenal. Since Arteta's appointment, the Gunners have been shown five more red cards (13 in total) in the Premier League than any other team.
Granted, they are the youngest team in the Premier League, so perhaps a hint of indiscipline is to be expected as a consequence of inexperience – but that argument can't really be applied to 26-year-old Holding.
Arsenal had actually started the match quite well. Their pressing intensity was excellent, so much so that a Spurs passage of play consisting exclusively of passes between the defence and Hugo Lloris drew significant jeers of derision and frustration from the home crowd.
But Spurs identified they could find joy by playing direct, which was exactly how the opener arrived, with Cedric Soares – no, not Holding this time! – the one guilty of barging Son over at the back post as he looked to reach a deep delivery.
Just four minutes after Holding's red card, Kane – who had endured a career-worst derby drought of two matches prior to Thursday – exploited Eddie Nketiah's lack of awareness to stoop in at the back post to head home his second goal of the game, extending his all-time record as this fixture's top scorer.
Conte was a figure of calm after the first goal, but this time he wore his near-trademark terrifying jubilation with pride, presumably aware only a miracle would save Arsenal now.
The sparkling Son made sure any Arsenal hopes were thoroughly extinguished less than two minutes after the restart, pouncing on a loose ball in the area before steering beyond Aaron Ramsdale with the kind of expertise we've come to expect from a player only outscored by Mohamed Salah in the Premier League this season.
Arteta can console himself with the fact Arsenal remain fourth heading into their final two games of the season. Had you given him the option of being in that situation back in August, he'd have snapped your hand off.
But Thursday's ultimately crushing defeat once again raised questions of the Gunners' mentality and discipline, and their squad is becoming more depleted by the game. It's hardly an ideal combination when the pressure is on – and boy is it on now.
Tottenham – whose kind run-in sees them face Norwich City and Burnley – still need either Newcastle United or Everton to do them a favour at the very least.
But Thursday was evidence of Spurs keeping their cool when it matters. Arsenal didn't, and there's nothing to suggest they're too good to capitulate.
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."
Klopp hails 'special' Anfield following Tottenham win
Jurgen Klopp says Anfield "was a special place" after Liverpool got back to winning ways at home against Tottenham in the Premier League on Sunday.
The Reds cruised into a 4-0 lead against Spurs by the 59th minute as Mohamed Salah and Harvey Elliott played starring roles, with Andrew Robertson and Cody Gakpo also getting on the scoresheet.
They were set up for a slightly nervous finish by Spurs, with substitute Richarlison coming on to score and assist late on to half the deficit to 4-2 by the final whistle.
Victory kept Liverpool’s very slim title hopes alive after a recent dip in form that saw them take just one win from five before this, and Klopp was pleased with the Reds’ reaction in his penultimate game at Anfield.
"We are outstanding until we are not," the German told Sky Sports. "It was a really good game. Tottenham can put pressure on Aston Villa again for the Champions League. In high-performance things, you need a spark.
"Anfield was a special place today. We were 4-0 up, I made the changes, and we lost organisation. Tottenham showed how good they could be. I was happy with the performance.
"We were good in pretty much all areas offensively. The passes were good. So many things were good. We stayed calm. As long as they don't break the lines, then it's fine. Let them pass. I liked our game a lot. The goals were outstanding.
"You do it when you do it and if you miss it, then you miss it. If we win all three, then we can achieve the fifth-highest points tally of Liverpool.
"I would be lying if I said I was at my highest emotion, but I have another game. In two weeks’ time is another day. I have said it before, I love absolutely everything about this club."
Salah was restored to the starting line-up against Spurs after making headlines last weekend for a spat with Klopp on the sideline before he was brought on as a substitute.
He scored the opening goal for Liverpool and became the first player in Premier League history to score 10+ goals and provide 10+ assists in three consecutive seasons. He is also only the second player to tally 10+ in both in five separate seasons in the competition overall, after Wayne Rooney.
After assuring that the rift between him and Salah was resolved in the build-up to this game, Klopp was quick to praise his star man.
He added: "Mo was outstanding, he played a really good game. His side with Harvey [Elliott] was good. I was pleased for him.
"None of the boys want to play not great, why would they? Mo showed what he is capable of."
Salah makes Premier League history in Anfield thriller
Mohamed Salah made more Premier League history as he scored and provided an assist in Liverpool's 4-2 win over Tottenham.
Salah, who had a public disagreement with outgoing Liverpool boss Jurgen Klopp during last week's 2-2 draw with West Ham, was back at his best as the Reds returned to winning ways on Sunday.
He opened the scoring in the 16th minute at Anfield, where Liverpool cruised into a 4-0 lead before Spurs fought back to make matters interesting late on.
Harvey Elliott curled in Liverpool's fourth goal, having received a pass from Salah, who in the process went into the Premier League's record books.
Salah is the first player in Premier League history to score 10+ goals and provide 10+ assists in three consecutive seasons.
Meanwhile, he is also only the second player to tally 10+ in both in five separate seasons in the competition overall, after Wayne Rooney.
"Mo was absolutely outstanding," Klopp told Sky Sports.
Salah's earlier goal had also seen him draw level with Harry Kane as the highest goalscorer in Premier League matches between Liverpool and Spurs, with nine. He is also squandered a great chance to make it 5-2, before seeing a goal disallowed for offside in stoppage time.
Indeed, the fixture itself is now the highest-scoring one in Premier League history, having overtaken Arsenal v Liverpool.
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