For instance, if Iran and Portugal draw 3-3 and Spain lose 1-0, Spain would be level on points with Iran, with the same goal difference and goals scored, but Spain would go through on head-to-head after their 1-0 win over Iran earlier in pool play.
Footage has emerged of Iranian fans gathered outside the Portugal team hotel at Saransk, chanting, blowing horns and beating drums as the two nations prepare to face off in their final 2018 FIFA World Cup Group B clash.
Mexico need only a draw against Sweden on Wednesday while a win would see them top the group with maximum points.
Spain and Portugal sit top of the group on four points with Iran on three and Morocco eliminated with no points so far.
Such an event has never happened previously at the World Cup, and it would likely present something of a headache to Gianni Infantino and friends.
Saudi Arabia: Eliminated. Will finish third if they beat Egypt.
A lot of eyes are focused on this group with Lionel Messi's Argentina facing elimination unless they beat Nigeria and Iceland fail to beat leaders Croatia, who could still drop to second if they don't win. Can also advance with a draw AND Spain losing by more than a goal OR by scoring enough goals to pass Spain's total for the tournament. Wins for Germany and Sweden would mean three teams would finish with six points, sending it to tiebreakers.
Identical records would then see qualification decided by the better result when the teams met, which would see Germany go through courtesy of their 2-1 win.
Australia need to beat Peru, also at 2am, and hope Denmark lose.
A win would take Serbia through and a draw could be enough if Switzerland lose by two.
Mexico wins again at World Cup, beats South Korea 2-1
With the second goal Mexico tried to shut up shop by sending on the experienced Rafael Marquez for Guardado. Mexico were awarded a penalty when Jang Hyun-soo handled a cross from Andres Guardado after 23 minutes.
Obama Blasts Trump For 'Ripping Children From Their Parents' Arms'
If those options are exhausted, authorities must find the "least restrictive" setting for a child who arrived without parents. It also directs the Department of Defence to take steps to house detained immigrant families as needed.
Oil rises ahead of OPEC meeting while trade disputes loom over markets
Saudi Arabia and some other Persian Gulf producers have supported the United States in imposing sanctions on Iran. Falih also said the real increase for OPEC and non-OPEC would be smaller than the nominal gain of 1 million bpd.
France are already through but will want to beat Denmark on Tuesday to take top spot, although a draw would also keep them clear.
If the match ends in a draw, Russian Federation will top the group on goal difference.
Can advance with a win over Nigeria and a loss or draw for Iceland. Nigeria will be buoyed by their victory over Iceland and a win against a shambolic-looking Argentina will secure them a spot in the knockout stages.
Serbia were unlucky to not get at least a point against Switzerland, so could provide a massive shock against Brazil, although it seems unlikely.
Mexico will top the group with a win or draw against Sweden.
Advances with win or draw against Costa Rica OR a Serbia loss to Brazil.
Japan and Senegal will advance with draws against Poland and Colombia respectively.
Japan need only draw with Poland, who have been eliminated, to progress to the next round.
Group F plays before this group on Thursday, so these teams will know who has won that group.