Anastasios Douvikas led the rout with a hat-trick as cruised to a 9-1 victory at , equalling the record for the most goals scored in a single Champions League game.
Only two teams had previously won a game by a margin of eight goals since the launch of the modern Champions League in 1992. Liverpool thumped Besiktas 8-0 in the group stage in 2007 and Real Madrid won by the same scoreline against Malmo in 2015.
Como are just the second team to score nine times in a game in the competition, after Bayern Munich beat Dinamo Zagreb 9-2 in the league phase in 2024.
Cesc Fàbregas's side made it three wins from four in their maiden campaign in the competition with a spellbinding display.
Nico Paz continued his fine form with a goal and two assists, while Lucas Da Cunha, Marc-Oliver Kempf, Mattia Liberali, Martin Baturina and Matteo Papaccioli also scored for the Serie A side, who had already beaten both RB Leipzig and Manchester United 4-1 at home in this campaign.
The last club to score nine away from home in the European Cup was Feyenoord against Olympiakos in 1971.
Federico Valverde lashed home a stunning effort from distance to snatch a late 3-2 victory at on Wednesday and preserve their 100% start in the group phase.
José Mourinho's side, who started with Vinícius Júnior on the left flank after he missed the team's previous two La Liga matches through suspension, twice came from behind against the Greek champions before Valverde claimed all three points for his side.
Aboubakary Koïta sent AEK ahead after 12 minutes before Jude Bellingham equalised with a sublime flick for the record 15-time winners.
Stavros Pilios sent the Greek champions ahead with 15 minutes to go but Kylian Mbappé swiftly pulled Madrid level once again, setting the stage for Valverde's late winner.
Madrid have now won seven successive games across all competitions.
Scott McTominay found the net but endured a 4-1 defeat by , who had lost their first three games in the competition, while are up to ninth after a 2-1 win at .
Konstantinos Karetsas struck a 72nd-minute winner as beat 2-1, while Erik Botheim helped himself to two goals as secured their first triumph with a 4-1 win against 10-man .