Chelsea got their Champions League campaign off to the worst possible start as they suffered a surprising 2-1 defeat to FC Basel in their group E opener at Stamford Bridge on Wednesday.
Elsewhere in the group, Schalke beat Steaua Bucharest 3-0.
Former Real Madrid forward Gonzalo Higuaín scored just before the break while Lorenzo Insigne added another in the 67th minute as Napoli edged out Borussia Dortmund 2-1 at the Stadio San Paolo.
This win sees Rafael Benítez’s men share top spot with Arsenal after their win over Marseille.
Argentina’s Lucho Gonzalez scored just after the restart to hand Porto a narrow 1-0 win over Vienna while Atletico thumped Zenit Saint Petersburg 3-1 thanks to goals from Brazil defender Miranda, Arda Turan and Léo Baptistão.
In group H, Lionel Messi edged closer to Raul’s all-time Champions League scoring record with a hat-trick as Barcelona hammered Ajax 4-0 while Italian giants AC Milan needed two late goals to down Celtic 2-0 at the Stadio Giuseppe Meazza.