Group D remains interesting.
That goal cancelled out a superb strike from Ricardo Quaresma on the stroke of half-time, which ultimately saw Portugal through to a second-round meeting with Uruguay while group winners Spain face Russian Federation.
Ansarifard converted the resulting penalty to level the score, pushing Portugal to second position in the group behind Spain.
Saudi Arabia have finished bottom of their group at their past three World Cups.
Ronaldo scored his first-ever World Cup goal in a 2-0 win over Iran back in 2006.
Now both Spain and Portugal, not to forget Iran, are targeting the top two places in Group B.
Despite failing to impress in one-goal wins over Australia and Peru, hotly tipped France are guaranteed of a place in the round of 16. A draw in the final group game would see the leaders decided by fair play rules or by drawing of lots.
Switzerland advances with a win or a draw against Costa Rica.
One thing I can be certain of and you can too is that the matches both Spain and Portugal are going to be playing in will see plenty of goals being scored, and there are no prizes for guessing which two players will have their sights set on scoring the most goals for each team!
Here, now, is a look at the various scenarios that may play out in the final round of Group play.
Nigeria will advance with a win over Argentina. A point would be enough if Iceland do not beat Croatia.
"Always when we play against teams that are eliminated we don't know what they are going to do", Hierro told reporters on Sunday. With a draw against Argentina, it will come down to how Iceland does against Croatia. Entering the final matchday, Group B has yet to produce a definitive knockout stage representative.
Federation Internationale de Football Association looks at the points obtained in the group matches between the teams concerned, goal difference in those matches and Number of goals scored in the group matches between the teams concerned.
Tite's men are through if they get at least a point against Serbia in Moscow on Wednesday.
Nigeria, on three points, will secure their spot in the last 16 with a victory over Argentina, who sit bottom of the group on one point behind Iceland on goal difference.
Group F suddenly looks a bit different after that late victor. Over in Group A, Russian Federation and Uruguay are through, but top spot is up for grabs as they go head to head.
Currently, England lead due to a better disciplinary record.
Portugal face Iran on Monday in what is likely to be a victor takes all showdown in Kaliningrad. Senegal and Colombia play off with the victor qualifying, while a draw will be enough for the African side - or could see both through if Japan were to lose.
Colombia will progress if they beat Senegal and a draw will suffice if Poland beat Japan.
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