Group A
Napoli 4-1 Liverpool
Liverpool made a disastrous start to the UEFA Champions League campaign after suffering a 4-1 loss to Napoli.
The Serie A side opened the scoring from the penalty spot on five minutes when Piotr Zielinski converted, before Nigerian striker missed from the spot in the 18th minute.
Napoli went on to double their lead through Zambo Anguissa's first goal of the club before Giovanni Simeone made it 3-0 before the break.
The second half began like a house on fire as Zielinski made it 4-0 shortly after the break, before Luis Diaz pulled one back with a neat strike in the 49th minute.
Ajax 4-0 Rangers
Ajax enjoyed a perfect start to the group stages with a 4-0 thrashing of Rangers at the Johan Cruijff Arena.
The Dutch champions were quite clinical in the first half, as Edson Álvarez, Steven Berghuis and Mohammed Kudus were on target.
Steven Bergwijn rounded of the scoring for the home side in the final 10 minutes.
Group B
Atletico Madrid 2-1 FC Porto
Atletico Madrid struck late in the second half to secure a 2-1 win over FC Porto on Wednesday evening.
The game was seemingly headed for a draw until Hermoso popped up with the first goal in the first minute of second half stoppage time.
Mateas Uribe converted a penalty for Porto in the 96th minute to level matters, however Antoine Griezmann had the final say after bagging the winning goal in the 11th minute of stoppage time
Club Brugge 1-0 Bayer Leverkusen
Club Brugge made a winning start in Group B after defeating Bundesliga outfit Bayer Leverkusen.
The Belgian champions opened the scoring on 42 minutes, with Loubadhe Sylla getting his first goal of the season.
Group C
Barcelona 5-1 Viktoria Plzn
Barcelona made light work of Viktoria Plzn after cruising to a 5-1 win at the Camp Nou on Wednesday night.
Ivory Coast international Franck Kessie opened the scoring on his first start for the club, before Robert Lewandowski doubled the lead on 34 minutes.
Jan Sýkora pulled one back for the visitors just before the break but Lewandowski restored the two-goal cushion a couple minutes later.
Xavi Hernandez's men took over in the second half Lewandowski bagged two more goals to complete his hat-trick, while Ferran Torres rounded off the scoring in the 71st minute.
Inter Milan 0-2 Bayern Munich
Bundesliga giants Bayern Munich started their campaign with a 2-0 win away to Inter Milan.
Leroy Sane opened the scoring the for the Bavarians in the 25th minute after being set up by Joshua Kimmich.
The second goal arrived just after the hour mark when Danilo D'Ambrosio deflected the ball into his own net.
Group D
Tottenham Hotspur 2-0 Marseille
Tottenham Hotspur made a winning start on their return to the Champions League after defeating Marseille 2-0 in North London.
Brazil international Richarlison made the most of his tournament debut by bagging a second-half brace to guide his side to victory.
Eintracht Frankfurt 0-3 Sporting Lisbon
Sporting Lisbon got off to a flying start as they thrashed Eintracht Frankfurt 3-0 at the Deutsche Bank Park.
The first half ended goalless, but Marcus Edwards, Trincao and Nuno Santos were all on target in the second half.
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