Fluminense get a lot of yellow cards in almost every game, I think it could happen again today... I am not sure that Al Hilal can win in regulation time, but I think they can make it to the semi-finals... For me, the more interesting match will be with another Brazilian club against Chelsea... I expect a lot of corners and a Chelsea win... Although this championship is really very difficult to predict...
I agree with your comment about Fluminense - Al Hilal match, it is true that Fluminense showed an aggressive style of play especially with yellow cards. I am also cautious about Al Hilal winning in normal time.
Fluminense's unbeaten streak of 7 wins, 3 draws in the last 10 matches and their solid defense, combined with Al Hilal's injury problems and the absence of Al-Dawsari, Tambakti and Mitrovic, seems like a close match, a very interesting match under the current conditions.