Hakim Ziyech scored a goal as Ajax hammered Feyenoord 4-0 in Sunday's De Klassieker.
The Morocco international started the party for Erik ten Hag's side in the opening minutes of the fixture with his second-minute strike.
The goal increased Ziyech's tally to five goals and five assists in the Eredivisie this term.
Andre Onana, on his part, kept his fifth clean sheet in the Dutch top-flight this season to help Ajax stretch their dominance at the summit of the table.
He was in action for 90 minutes but Ziyech was replaced in the 74th minute.