Champions League: Holders Liverpool stunned by Napoli

By James Masters and Matias Grez, CNN

Updated 5:02 PM ET, Tue September 17, 2019

What we're covering here

It's back! Yes, that's right, the European Champions League is back with eight group games taking place across the continent on Tuesday. We'll be keeping an eye on all the key clashes as some of football's biggest names begin their quest for the top prize.

Which teams are in action? We're glad you asked. Defending champion Liverpool faces a difficult trip to Italian side Napoli, while Barcelona travels to Germany to take on Borussia Dortmund. Last year's semifinalist Ajax is at home to French club Lille while 2012 winner Chelsea hosts Valencia.

Full list of fixtures below. (Games kick off at 3 p.m. ET unless otherwise stated)

Group E: Red Bull Salzburg vs Genk, Napoli vs Liverpool

Group F: Inter Milan vs Slavia Prague (12.55 p.m. ET), Borussia Dortmund vs Barcelona

Group G: Lyon vs Zenit St Petersburg (12.55 p.m. ET), Benfica vs RB Leipzig

Group H: Ajax vs Lille, Chelsea vs Valencia

5:53 p.m. ET, September 17, 2019

That's all folks

What a night.

Liverpool beaten, Barcelona held and a teenager scoring a first-half hat-trick to inspire his side to a 6-2 home win. Not a bad start for opening night.

You can read all about Liverpool's 2-0 defeat in Naples here.

We're back on Wednesday for more action including two huge clashes with Paris Saint-Germain taking on Real Madrid and Juventus going up against Atletico Madrid.

Make sure you join us for all the goals as they go in. It's sure to be another enthralling night of Champions League drama. Until then, goodbye!

5:34 p.m. ET, September 17, 2019

Klopp: "I don't think it's a penalty"

Liverpool coach Jurgen Klopp was critical of referee Dr. Felix Brych for awarding Napoli a late penalty during his team's 2-0 defeat in Italy.

Dries Mertens converted an 83rd minute spot kick after Andrew Robertson was adjudged to have fouled Napoli's Jose Callejon inside the penalty area.

Jurgen Klopp's side was beaten 2-0 in Naples. Andreas Solaro/Getty Images

"I don't think it's a penalty," Klopp told BT Sport.

"What can I say, for me, it is clear and obvious no penalty. He jumps before any contact, we can't change that.

"We played a lot of good football but didn't finish it off. We controlled moments but had not enough chances in the end. We made decisions that were not right and have to accept the result. It was very often the final ball that was not right."

5:26 p.m. ET, September 17, 2019

Hummels: Dortmund "played brilliantly"

Borussia Dortmund defender Mats Hummels has been speaking after his side's 0-0 draw with Barcelona.

The German side had a penalty saved and created numerous other chances but were unable to find a way past Barcelona goalkeeper Marc-Andre Ter Stegen.

"We played brilliantly in the second half, and it feels a bit like we have lost two points," Hummels told Sky Germany.

"It is a tough group and we could have put ourselves in a good position with a win today."

5:12 p.m. ET, September 17, 2019

Remember the name

What a night for 19-year-old Erling Braut Haland.

The teenager scored a first-half hat-trick in Salzburg's 6-2 home win over Genk.

Erling Braut Haland scored a first half hat-trick in his side's 6-2 win over Genk. Krugfoto/CNN

5:04 p.m. ET, September 17, 2019

The results are in ...

Napoli 2-0 Liverpool

Salzburg 6-2 Genk

Borussia Dortmund 0-0 Barcelona

Benfica 1-2 RB Leipzig

Chelsea 0-1 Valencia

Ajax 3-0 Lille

Inter Milan 1-1 Slavia Prague

Lyon 1-1 Zenit St. Petersburg

5:00 p.m. ET, September 17, 2019

FULL TIME: Borussia Dortmund 0-0 Barcelona

Dortmund will be left wondering how it failed to win this one after missing a plethora of chances, including a second half penalty.

A brilliant performance from Marc-Andre Ter Stegen denied the home side, the goalkeeper saving Marco Reus' second half spot kick, as well as producing a number of fine saves.

Julian Brandt hit the woodwork, while Jadon Sancho turned in another impressive performance.

Barcelona, buoyed by the introduction of Lionel Messi in the second half, will be pleased to have escaped with a point.

4:58 p.m. ET, September 17, 2019

FULL TIME: Napoli 2-0 Liverpool

Not the start defending champion Liverpool had in mind but there can be few complaints as Napoli claim all three points with a 2-0 win.

A Dries Mertens penalty and a late goal from Fernando Llorente secured victory for the home side.

Liverpool, which lost all three away games in the group stage last season, had its chances but failed to find a way past a stubborn Napoli defense.

4:52 p.m. ET, September 17, 2019

GOAL!!!

Liverpool fans look away now ... It's Napoli 2-0 Liverpool and it's Fernando Llorente, the man who helped Tottenham reach the final last season who takes advantage of some dreadful defending to fire home.

Safe to say it has not been Liverpool's night ...

Napoli 2-0 Liverpool

4:45 p.m. ET, September 17, 2019

GOAL!!!

Benfica have hit back in Lisbon.

Haris Seferovic's 84th minute strike makes it Benfica 1-2 RB Leipzig.

Timo Werner has scored twice for the German side.

Outbrain