First half goals from Steven Berghuis and Sebastien Haller gave Ajax a 2-0 win over Besiktas on Tuesday.
Victory helped to keep them perfect with two victories from two in UEFA Champions League Group C.
The same pair had bagged all the goals in their opening rout against Sporting Lisbon.
Côte d’Ivoire striker Haller, who scored four in Portugal, is now on five goals from two matches in the elite competition.
Shakhtar Donetsk and Inter Milan both got off the mark with their first point in Group D thanks to a 0-0 draw.