Liverpool made it back-to-back wins in the Champions League with a 4-1 victory away to Genk.
Alex Oxlade-Chamberlain scored twice, while Sadio Mane and Mohamed Salah got the other goals.
Elsewhere, Lionel Messi clinched another goal-scoring record as Barcelona overcame Slavia Prague 2-1.
The Argentine opened the scoring after three minutes to become the first player ever to score at least once in 15 consecutive Champions League seasons.
The Spanish giants are now three points ahead of Inter Milan who beat Borussia Dortmund 2-0 in the other Group F encounter.
Chelsea grabbed a late 1-0 victory at Ajax. Michy Batshuayi struck the winner with just four minutes remaining in Amsterdam.
Napoli defeated Salzburg 3-2 in a game that saw Dries Mertens go past Diego Maradona’s 115-goals tally for the Italian club.
In other games, Benfica edged Lyon 2-1, Valencia drew 1-1 with Lille, and Leipzig defeated Zenit 2-1.