We know 4 of the final 16 after the 4th round of the UEFA Champions League group stage.

Champions League -Match Day 4

Five out of the 32 teams remain unbeaten. Four of the seven have maintained a 100% winning record.

Liverpool in [Group B], Ajax in [Group C], Bayern Munich in [Group E], and Juventus in [Group H] stayed on their 100% winning start to qualify for the Round of 16.
With the exception of the four ‘perfect’ teams, Paris St. Germain is the other unbeaten side left.

4/16 Qualified for the Round of 16.
Ajax
Bayern
Juventus
Liverpool

Salzburg and Sevilla both lost their ‘unbeaten’ status in [Group G] after both were on the end of a 2-1 defeat.
RB Leipzig and AC Milan picked up their first point (each) to leave Besiktas and Malmo as the teams without points.

Wolfsburg was the only losing side from the reverse round that turned it around in this round. After a draw with Sevilla, Lille won while Atalanta, RB Leipzig, and AC Milan could only use home advantage to pick up a point.

NOVEMBER 2, 2021
Bayern Munich 5-2 Benfica
Dynamo Kyiv 0-1 Barcelona
Villarreal 2-0 Young Boys
Atalanta 2-2 Manchester United
Sevilla 1-2 Lille
Wolfsburg 2-1 Red Bull Salzburg
Juventus 4-2 Zenit Saint Petersburg
Malmö FF 0-1 Chelsea

Cristiano Ronaldo scored in both sets of additional minutes to get Manchester United a point in Bergamo against Atalanta.

Villarreal took three points from Young Boys (again).

Ansu Fati’s goal was the difference-maker for Barcelona to beat Dynamo Kyiv by another 1-0 scoreline.

Robert Lewandowski contributed a hattrick to Bayern Munich’s 5-2 win against Benfica.

Wolfsburg and Lille win their first in Group G with a ‘2-1’ win from their respective matches.

Hakim Ziyech’s goal got Chelsea a win against Malmo.

Paulo Dybala was on the score sheet on two occasions as Juventus picked up another win against Zenit.

Group E
1. Bayern Munich – 12 points
2. Barcelona – 6 points
3. Benfica – 4 points
4. Dynamo Kyiv – 1 point

Group F
1. Manchester United – 7 points
2. Villarreal – 7 points
3. Atalanta – 5 points
4. Young Boys – 3 points

Group G
1. Red Bull Salzburg – 7 points
2. Lille – 5 points
3. Wolfsburg – 5 points
4. Sevilla – 3 points

Group H
1. Juventus – 12 points
2. Chelsea – 9 points
3. Zenit Saint Petersburg – 3 points
4. Malmö FF – 0 points

NOVEMBER 3, 2021
RB Leipzig 2-2 Paris Saint-Germain
Manchester City 4-1 Club Brugge
AC Milan 1-1 Porto
Liverpool 2-0 Atlético Madrid
Borussia Dortmund 1-3 Ajax
Sporting CP 4-0 Beşiktaş
Real Madrid 2-1 Shakhtar Donetsk
Sheriff Tiraspol 1-3 Inter Milan

Manchester City took back the lead and added two more goals in teh second half after John Stones’s own goal canceled out Phil Foden’s opener to get Club Brugge to break on level terms.

RB Leipzig had their chances to win at home against Paris St. Germain and missed it.
Gianluigi Donnarumma’s penalty save in the 12th minute denied RB Leipzig an early chance to double the lead. A clinical Paris St. Germain was a goal up before the halftime break after goals from Georginio Wijnaldum.
Kylian Mbappe had two of the best chances in the second half to increase PSG’s lead but couldn’t convert on the counter. The missed opportunities came back to haunt PSG when a late penalty call allowed Dominik Szoboszlai to score the equalizing goal in the second minute of the additional time.

Another game, another win for Liverpool (against Atletico Madrid). Just like in the reverse fixture, Atletico Madrid ended up playing with a numerical disadvantage after Felipe was sent off on a red card in the 36th minute while his side was already two goals down.
Trent Alexander-Arnold assisted both of Liverpool’s goals to get them a 2-0 win that carried them to the Round of 16.

In a desperate need for a win, the best AC Milan could do at home was coming back from a goal down to deny Porto the win.

Ajax booked their place in the Round of 16 with goals in the final 20 minutes. Even though Mat Hummel was sent off right before the 30th-minute mark, it was Dortmund that was first to get the lead.

Sporting CP left no doubt at the end of the first round when they took to the break a 3-0 lead to be eventual 4-0 winners against Besiktas.

Karim Benzema’s brace got Real Madrid a 2-1 win over Shakhtar Donetsk, while Inter Milan won it in the second half to leave as 3-1 winners (again) over FC Sheriff.

Group A
1. Manchester City – 9 points
2. Paris Saint-Germain – 8 points
3. Club Brugge – 4 points
4. RB Leipzig – 1 point

Group B
1. Liverpool – 12 points
2. Porto – 5 points
3. Atlético Madrid – 4 points
4. Milan – 1 points

Group C
1. Ajax – 12 points
2. Borussia Dortmund – 6 points
3. Sporting CP – 6 points
4. Beşiktaş – 0 points

Group D
1. Real Madrid – 9 points
2. Inter Milan – 7 points
3. Sheriff Tiraspol – 6 points
4. Shakhtar Donetsk – 1 point

Bayern Munich’s Robert Lewandowski’s hattrick pushed him to the lead in the goalscorer’s list. Lewandowski replaced Ajax’s Sebastien Haller

Robert Lewandowski (Bayern Munich) – 8 goals
Sebatien Haller (Ajax) – 7 goals
Mohamed Salah (Liverpool) – 5 goals
Cristiano Ronaldo (Manchester United) – 5 goals
Christopher Nkunku (RB Leipzig) – 5 goals.