Gabri Veiga scores for Porto. Could the Portuguese side be heading for their first win of the group stage? That one means a heck of a lot.

A big goal for Betis in the Westfalenstadion! Aitor Ruibal hasn't been on the pitch for very long but he's levelled things up for the Spanish outfit, who continue to impress in the Champions League this season.

That Lens goal v Como:

(For Oscar, see Ruben Aguilar)

Lens have scored! Sound the alarm! It's 7-1 now.

And in the Viking v Sabah game, the Norwegian side have taken the lead to make it 2-1, with Zlatko Tripic scoring the rebound after his initial penalty was saved.

Brugge are back in front against PSV – another team to quickly respond to losing their lead. Carlos Forbs, formerly of Wolves, has got the goal this time.

Liverpool and Real Madrid's 8-0 victories over Beşiktaş and Malmö respectively stand as the Champions League's biggest winning margins. Both records now could be in danger.

7-0 to Como. Although this one will be checked for offside. Fabregas has taken some big players off but the substitute Mattia Liberali, 19, has scored … and yes it will count. There's still 27 minutes plus added time remaining in this game. Surely you now head for the exit if you're a Lens fan?

Antonio Nusa is some footballer, by the way. If you're looking for your next major import to the Premier League from the Leipzig talent factory – a la Benjamin Sesko, Josko Gvardiol, Dominik Szoboszlai, Christopher Nkunku et al – the Norwegian winger is a very solid bet.

What a game this is! City's lead does not last long this time as Leipzig work it to Antonio Nusa on the left side of the box, and he does not disappoint with a low left-footed finish.

Enzo Maresca's side look suddenly porous at the back and Leipzig have what they deserve … again.

6-0 to Como. I can't keep up. Douvikas completes his hat-trick, and takes his UCL season's tally to six in the process. This could be a cricket score. It's already a tennis score.

City have restored their lead in no time! Ndiaye teases home a superb cross that was begging to be met … and Enzo Fernández is the man! He powers home a clinical headed finish.

Honestly, Como are making a mockery of this competition – or maybe just of Lens. It's now 5-0 to Fabregas's fantastic team, Marc-Oliver Kempf getting in on the act. A classic case of getting in on the act, actually.

This has been another really enjoyable game, from the bits I've seen, and PSV have found a fortunate equaliser via Japanese international midfielder Kodai Sano. He squeezed home after an almighty deflection.

After a watchable but goalless first half, the breakthrough at Signal Iduna Park arrives for the home side, with Fabio Silva scoring a poacher's goal after Jobe Bellingham's shot was blocked in the box.

Real Betis's perfect Champions League record this season is now at serious risk. As it stands, only PSG and Real Madrid will have four wins under their belts.

This is probably a case of speaking way too soon, but it's been refreshing not to see too many fastidious VAR checks for handball or other types of dubious penalty shout. The early rounds of this Champions League group stage were riddled with such occurrences.

That was coming! Another rapid Leipzig breaks sees the white shirts flood forward and this time Donnarumma is at fault. Somehow he's let a cross from Ridle Baku in at the near post … talk about from hero to zero!

He should have done a lot better with that, it was simple fare for elite goalkeepers, usually gobbled up.

It's an absolute procession for Como in Lens as Da Cunha drills home from Nico Paz's pass to make it 4-0. This Italian team have come to play in this season's Champions League. Lens are done.

What a save from Donnarumma to deny Christoph Baumgartner. That shot was bound for the top right corner before the Italian sprung high and got an important fingertip to it.

Leipzig are growing a little frustrated that their attacking efforts have had no reward thus far.

Manchester City are lucky to be ahead in Leipzig, and you sense they will have to step up in the second half to avoid another winless 90 minutes. They cannot seem to get Erling Haaland in the game, chances for any of their forwards in fact have been scant.

Arsenal's opponents are more lightweight than Leipzig, but still the Gunners' sharpness going forward has been notable, despite Mikel Arteta resting the likes of Kai Havertz, Martin Ødegaard and Christos Tzolis so far.

The second halves are mostly under way around Europe. Let's get into the updates again.

Here are the reports from the earlier games.

And right there, after a hectic 45 minutes typing, I shall take the shortest of breaks! Plenty more fun to be had in the second halves.

The half-time whistles are starting to sound. We'll round up all the scores soon.

Napoli had wasted a couple of chances to get level in Porto but Scott McTominay – who else? – has found an equaliser a few minutes before half-time. A great reactive rebound effort from the former Manchester United man.

Paz paid tribute to Tenerife striker Jesus de Miguel with a t-shirt showing the player's image, after scoring his goal. Paz grew up on Tenerife and was part of the club's academy for two years as a boy.

3-0 to Como in Lens. Nico Paz. Cesc Fabregas is clearly the greatest football coach to have ever graced our good game.

City haven't been at their scintillating best against Leipzig so far, but they've been handed the lead by an awful own goal by Castello Lukeba. There were a million things he could have done with Nico O'Reilly's cutback … other than to bundle it into his own net.

Just when I thought I may be wrong about Arsenal in my earlier post, with the Slavia defence seemingly holding up well, Viktor Gyökeres slides one into the far corner after nice interplay with Mikel Merino. Two-nil and it will probably be more before long.

Douvikas is now out on his own as the top-scorer in this season's Champions League so far, with five goals.

Tresoldi of Club Brugge is there on four alongside a tranche of star names, including Ballon D'Or's Harry Kane, Erling Haaland, Dortmund hitman Guirassy and Roma's Donyell Malen.

We'll keep tabs on that.

Como have doubled their lead at Lens! Douvikas nets his second of the evening for Cesc Fabregas's side, who are seriously enjoying life in the Champions League, aren't they? (0-2)

This isn't Champions League-related, but a quick check of how West Ham are faring in their first game after sacking Nuno Espírito Santo and appointing Scott Parker … and they are 3-0 down at Cardiff City.

Jack Moylan has bagged a hat-trick for the Bluebirds. Perhaps there will be no quick fix for the Hammers.