John Guidetti scored a hat-trick as Feyenoord beat their bitter Dutch rivals 4-2 this afternoon.
Ajax started the match brightly and opened the scoring through reported Manchester United transfer target Christian Eriksen.
However, Guidetti, who is on loan with the Rotterdam-based club from Manchester City, scored twice before the break, with one coming from the penalty spot to put his side 2-1 up.
Otman Bakkal opened up a two-goal advantage for the home side five minutes after the restart.
Ajax fought back though and reduced the arrears in the 80th minute courtesy of Dmitry Bulykin.
The game was put beyond the visitors' reach just three minutes later when Guidetti rounded off the scoring with his third of the afternoon.