The final round of World Cup group games begin on Monday, as teams vie for a place in the knockout stages.
Here Sport360 offers a guide to the permutations in Groups A to F, with the second round of matches in Groups G and H still to be concluded.
GROUP A (Brazil, Cameroon, Croatia, Mexico)
Mexico need a win or a draw against Croatia to reach the last 16. They can win the group if they better Brazil's result against Cameroon, or if both sides win but they finish with a superior goal difference to Brazil.
A draw could be enough to take Croatia through, but only if Brazil lose to Cameroon. A win would definitely see them through. They can top the group if they win and Brazil fail to beat Cameroon.
Cameroon cannot qualify for the knockout stages.
GROUP B (Australia, Chile, Holland, Spain)
Holland and Chile have both qualified for the last 16, but are fighting it out for top spot.
Holland have a superior goal difference, so just need to draw against the South Americans to hold on to first place.
Neither Australia nor Spain can qualify for the knockout stages
GROUP C (Colombia, Greece, Ivory Coast, Japan)
Colombia are guaranteed a place in the last 16. They just need to draw against Japan to secure top spot.
A win for the Ivory Coast will book them a place in the knockouts. A draw against Greece could allow Japan to pip them for second spot on goal difference, if Alberto Zaccheroni's team beat Colombia. Ivory Coast could win the group if they beat Greece and Colombia lose to Japan, but the South Americans' goal difference is currently four better.
Japan's best hope is to beat Colombia and keep their fingers crossed for Greece to beat the Ivory Coast but not overhaul Japan's goal difference.
Greece can still qualify but would have to beat the Ivory Coast. They would also have to hope that Japan failed to beat Colombia, or that if they did manage to beat them that they finished with an inferior goal difference, as the sides would be level on four points.
GROUP D (Costa Rica, England, Italy, Uruguay)
Costa Rica have already qualified for the last 16 and need just a point against England to secure top spot in the group.
Italy just need to draw against Uruguay to be sure of a last 16 place. Either the Italians or Uruguay could still snatch top spot if they win and Costa Rica lose, and they possess superior goal difference or goals scored by the end. If it goes to head to head record, Costa Rica would trump either team.
England cannot qualify for the knockout stages.
GROUP E (Ecuador, France, Honduras, Switzerland)
France have all but qualified for the last 16 and will ensure top spot in the group with a point against Ecuador. Only defeat by at least four goals, coupled with a big win for Switzerland against Honduras, would deny Didier Deschamps' men.
Ecuador currently hold the goal difference advantage on Switzerland, with both teams on three points in second and third. To be sure of reaching the last 16, the South Americans need to beat France and maintain that advantage.
Honduras can still qualify, but would have to beat Switzerland and hope for a defeat for Ecuador against France which allowed them to overtake both Switzerland and Ecuador on goal difference or, if goal difference was equal between the three sides, on goals scored.
GROUP F (Argentina, Bosnia-Herzegovina, Iran, Nigeria)
Argentina are guaranteed a place in the last 16 and just need a draw against Nigeria to be assured of top spot.
A draw will also book Nigeria's place in the knockout phase.
Iran can still qualify but would have to beat Bosnia and hope Nigeria lost to Argentina, and better them on either goal difference or, if still level, goals scored.
Bosnia cannot qualify for the knockout stages.
Teams level on points after the three matches will be separated first by goal difference, then goals scored, then the teams' head-to-head record, with lots drawn if teams cannot be separated by any of the above criteria.
