Ajax got a draw versus Benfica by 2-2 yesterday and they could have defeated Benfica too in fact. But I still don't think that this will cause a serious trouble for them in the second leg. I have zero expectation like Ajax would have a hard time destroying Benfica home. Benfica did a good job in Portugal and resisted them. But they can't do the same thing by the same effort to Ajax again. Ajax would demolish Benfica like they did to Sporting in the group stage of the tournament.
Tax actually could have won in the first leg at home to Benfica but they had to concede at the end of the match, so the match ended in a 2-2 draw, but this result was really deserved by Ajax Amsterdam considering they played as guests, but to go out alone we can predict that Ajax Amsterdam will win easily and qualify for the last 8 of the European Champions League this season, considering that Benfica is not a team that often surprises clubs that challenge for the European champions league title.