Rapid Vienna are halfway to knocking Ajax out of the Champions League as they lead 2-0 at half time of the second-leg of their second-round qualifying tie.
The away side took the lead after 14 minutes when Stefan Stangl crossed for striker Robert Beric to head in at the back post.
Ajax thought that they equalised just minutes later through Davy Klaassen, but the referee ruled that he fouled defender Jan Novota before blasting the ball in from close range.
The Dutch side continued to push forward, and striker Viktor Fischer went close with a low shot across the face of goal which missed by inches.
However, Vienna doubled their lead when Louis Schaub fired a low shot into the bottom corner from the edge of the box, leaving Ajax with an uphill task to get through.