Ajax led 2-1 but Roman Yaremchuk equalised for Benfica, bringing the score to 2-2 for the hosts. Haller also scored for his club, as well as his own goal.
Dusan Tadic scored the game’s first goal for the Dutch champions at the Estadio da Luz in Lisbon.
Sebastien Haller of Ajax had scored at both ends earlier in the game, tying the game for the visitors with his 11th goal of the season after scoring an own goal.
Roman yarmechuk came as a substitute and scored a late to level the game for the visitors.
In the 72nd minute, he equalised before removing his shirt to reveal the trident sign of Ukraine to extend his support for his home country at times of war.
On March 15, Ajax will host Benfica in the second leg of their contest, which is currently tied at 2-2.