Arsenal scored three goals in seven second-half minutes to beat Lille 3-0 and extend their perfect start to the Champions League.
Jurrien Timber's deft finish opened the floodgates just after the hour mark at the Emirates Stadium before Eberechi Eze and Bukayo Saka rounded off the scoring.
Victory takes Arsenal into a share of the lead at the top of the Champions League table alongside Barcelona and Sporting Lisbon.
Mikel Arteta was able to use the wealth of resources at his disposal as he made five changes to the side that beat Leeds 2-1 on Saturday.
But it was Lille boss Davide Ancelotti, son of Brazil coach Carlo Ancelotti, who was the happier after a goalless first half.
The visitors even had the ball in the net but Ayase Ueda was flagged offside.
Bruno Guimaraes came closest to breaking the deadlock for Arsenal before the break when he fired wide from close range and then saw a powerful shot from range parried by Berke Ozer.
The Gunners quickly went through the gears in the second period once Timber dinked the ball over Ozer from Noni Madueke's pass.
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Arteta had left arguably his three most potent attacking weapons on the bench and the introduction of Saka, Kai Havertz and Martin Odegaard made an immediate impact.
Saka's low cross picked out Eze, whose deflected shot flew into the top corner to end any doubt over the destiny of the three points.
The England winger then finished off an exquisite team move from Havertz's cut-back for Arsenal's third.
There were further cheers from the home fans when Olivier Giroud came on as a late substitute for Lille on his return to the club where he scored 105 goals in a six-year spell.
But Giroud could not conjure up another Emirates goal as Lille remain without a Champions League point after defeat to Real Betis on matchday one.
Atletico Madrid vs. Manchester United
Meanwhile, Atletico Madrid eased to a 2-0 win over Manchester United to pile pressure on Red Devils coach Michael Carrick.
Pablo Barrios pounced inside the first minute for Diego Simeone's side and, after Leny Yoro's 74th-minute red card set United back further, Ademola Lookman added another for the hosts in Madrid.
Man United have made their worst domestic start in 40 years and this league-phase defeat in the Spanish capital was another blow, with the team now winless in five games across all competitions.
Carrick handed Carlos Baleba his first start for the club since arriving from Brighton this summer, as well as pushing captain Bruno Fernandes out to the right side.
Atletico were without their skipper Koke, after the death of his mother, while coach Simeone selected Julian Alvarez from the off for the first time this season at the Metropolitano Stadium, after he tried to force a departure this summer.
"Defend what we love," Atletico fans ordered their supporters with a banner display before kick-off, and the Rojiblancos were ahead after just 50 seconds.
Alex Baena found a way in behind United's defence and cut the ball across for Barrios, with Ayden Heaven unable to keep the midfielder's shot from crossing the line.
Bryan Mbuemo might have equalised for the visitors, nudging the ball through Cristian Romero's legs but firing just wide.
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Alejandro Grimaldo came inches away from extending Atletico's lead with a free-kick which hit the angle between post and crossbar.
The hosts thought they had a second when Johnny Cardoso finished neatly from the edge of the box before half-time, but the goal was disallowed after a VAR review showed the ball had struck Marcos Llorente's hand during the build-up.
Alvarez, yet to score this season for Atletico, hit the post early in the second half.
United rallied and Fernandes's lob drifted narrowly wide before the Portuguese playmaker hit the crossbar from the left of the box after a corner routine.
However, the three-time European champions suffered a setback when defender Yoro was harshly dismissed after a VAR review for bringing down Canada striker Jonathan David as the last man.
It opened the door for Atletico to grab their second, with David foiled by goalkeeper Senne Lammens but London-born Nigeria international Lookman on hand to tuck home the rebound after 79 minutes.
Carrick withdrew playmaker Fernandes, looking ahead to the weekend visit to face rivals Leeds in the English top flight, where improvement is badly needed.
Atletico goalkeeper Jan Oblak saved from United substitute Matheus Cunha in the final stages but there was no way back for United.
Simeone's side were able to claim their first points after an opening defeat at Liverpool.
Bayern Munich vs. Viking
Bayern Munich were held 3-3 at Viking, with the Norwegian champions equalising late through Herman Haugen after Michael Olise was sent off.
Bayern trailed 2-0 at half-time thanks to goals from Gianni Stensness and Peter Christiansen.
Harry Kane seemed to have dragged Bayern to victory as he scored twice and set up another for a 3-2 lead, but Olise saw a second yellow inside a minute for dissent after throwing the ball at an opponent's face.
Viking made the most of their advantage, with Haugen scoring in the final minute to snatch the Norwegian champions a shock draw against the German giants.
Olise's red means he will miss next week's blockbuster clash with English champions Arsenal in Munich.
"It was a poor first half from us. We started the second half well and fought our way back. But the red card changed everything," Kane said.
(FRANCE 24 with AFP)