Amsterdam - Noussair Mazraoui scored an injury-time winner on Tuesday as Ajax Amsterdam beat Benfica 1-0 to remain unbeaten in Champions League Group E.
Goalkeepers Andre Onana and Odisseas Vlachodimos both made key saves throughout the encounter as it appeared that the match was set be a goalless stalemate.
However, Vlachodimos stood no chance as Mazraoui's shot in the 92nd minute was deflected into the back of net by Alex Grimaldo from Ajax's final attack of the match.
The win left Ajax at the top of the group, level with Bayern Munich who beat AEK Athens 2-0 earlier in the evening.
Both teams showed attacking intent at the Johan Cruyff Arena, but Benfica's quick and aggressive midfield largely canceled out Ajax's more measured passing game.
Onana had to save two quick saves in the opening five minutes to deny Rafael da Silva and Haris Seferovic, while Vlachodimos blocked two excellent Ajax chances from Kasper Dolberg in the 22nd minute and stuck out a right hand to palm away a powerful shot from Donny van de Beek in the 74th.
When Dolberg managed to beat Vlachodimos five minutes before half-time, German Conti hooked the ball off the line. Technology showed the ball almost - but not quite - fully over the line.
But there was no doubt about Mazraoui's emphatic shot from the edge of the penalty area in stoppage time.