8. Ansu Fati becomes the youngest scorer in a Champions League game

Barcelona's teenage sensation Ansu Fati created Champions League history on matchday 6. His late winner against Internazionalehim the youngest-ever scorer in the competition's history.
In the process, Fati broke the 22-year record held by Ghana's Peter Ofori-Quaye, who at 17 years 195 days had become the youngest scorer in the Champions League. Ofori-Quaye had scored in Olympiacos's 5-1 home win over Rosenborg in a group-stage game in the 1997-98 edition of the competition.
9. Atalanta become the first team to qualify for the knockout round after losing their first 3 games

The only tournament debutants in the 2019-20 UEFA Champions League, Atalanta, became the first team to qualify for the knockout round of the competition after losing their first three games.
After scoring just twice and conceding 11 goals in defeats to Dinamo Zagreb (4-0 away), Shakhtar Donetsk (1-2 home) and Manchester City (5-1 away) in their first three games, Atalanta conceded just one goal in their next three.
A 1-1 home draw with group-winners Manchester City followed by a 2-0 home win over Dinamo Zagreb and a 3-0 win at Shakhtar Donetsk confirmed Champions League action beyond Christmas for the competition debutants.
10. Bayern Munich record the best goal-difference by a Champions League group-winner

Bayern Munich completed their group stage engagements with a perfect 6/6 record, becoming only the 6th team and the first since Real Madrid in 2014-15 to win all their 6 group-stage games in the UEFA Champions League.
In the process, the Bavarian giants produced the best goal difference of '+19' by a group winner in the history of the competition, as they became only the 6th team to win all their 6 group-stage games in the Champions League.
AC Milan (1992-93), Paris Saint-Germain (1994-95), Spartak Moscow (1995-96), Barcelona (2002-03), and Real Madrid (2011-12 and 2014-15) are the only other teams to have a perfect group stage record in Champions League history.