Wednesday's World Cup schedule will see Groups C and D reach a conclusion with seven of the eight teams involved still looking to secure their places in the knockout stages.
All four nations in Group C are still in with a chance of qualification, but it is Poland in the box seat, as a point against Argentina will be enough to take them through.
Argentina realistically need to win to secure their place in the last 16. A draw could also be enough for La Albiceleste, but they would then be relying on goal difference and the outcome of Saudi Arabia's clash with Mexico.
In Group D, France are already through to the knockout stages after winning their opening two matches, and a point against Tunisia would be enough for them to seal top spot in the section, while the North Africans must win to stand any chance of progressing.
The crunch game in Group D will be between Australia and Denmark. A draw will likely be enough to take the Socceroos through, while Denmark, who were being talked up as dark horses heading into the finals, must win to keep their hopes of reaching the last 16 alive.
Messi and Co face decisive clash
What: Poland v Argentina
Where: Stadium 974, Doha
When: 19:00, Wednesday 30th November
How to watch: BBC1
Odds: Poland +600, Draw +240, Argentina -200
Argentina were being tipped by many as one of the favourites to go all the way in Qatar, but a shock defeat to Saudi Arabia in their opening group match put La Albiceleste on the back foot.
A must-win clash with Mexico then followed and, inspired by Lionel Messi, they claimed a 2-0 victory to keep their hopes of qualification alive.
Lionel Scaloni's side are -500 to reach the last 16, but only a victory over Poland will guarantee their passage through, with Messi again expected to play a key role, as he will be determined not to bow out of what is likely to be his final World Cup at the group stage.
Poland are -300 to make it through to the knockout stages of the World Cup for the first time since 1986, and they have their own talisman hoping to inspire their progress in Robert Lewandowksi.
Lewandowksi scored his first World Cup goal against Saudi Arabia last time out and he is 10/3 to get on the scoresheet against Argentina, while Messi is 21/20 to find the back of the net.
Saudis dreaming of knockout stages
What: Saudi Arabia v Mexico
Where: Lusail Iconic Stadium, Lusail
When: 19:00, Wednesday 30th November
How to watch: BBC2
Odds: Saudi Arabia +375, Draw +320, Mexico -150
It is 28 years since Saudi Arabia last reached the knockout stages of the World Cup, but they are 5/2 to progress this year after their famous victory over Argentina, and another win against Mexico would guarantee their place in the last 16.
A draw could also be enough for Herve Renard's side, but only if Poland lose heavily to Argentina, while opponents Mexico know they must win to stand any chance of preserving their record of reaching the knockout stages of every World Cup since 1994.
Goals have been the major problem for Mexico at these finals - they are yet to net in Qatar - but after coming off the bench in their opening two matches, Wolves striker Raul Jimenez could now be fit enough to start.
Jimenez has not featured for his club since August due to a groin issue, but he could provide El Tri with the firepower they need. Mexico are +300 to qualify for the knockout stages.
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Last chance for Denmark
What: Australia v Denmark
Where: Al Janoub Stadium, Al Wakrah
When: 15:00, Wednesday 30th November
How to watch: BBC2
Odds: Australia +600, Draw +320, Denmark -200
After picking up just a solitary point from their opening two games, Euro 2020 semi-finalists Denmark are on the brink of elimination and they must beat Australia if they are to stand any chance of reaching the knockout stages.
The Danes are -187 to qualify, while Australia, who will likely just need a point to advance through to the last 16, are +163 to finish in the top two of the group.
History is certainly on Australia's side, as these two teams played out a 1-1 draw during the group stage of the 2018 World Cup. A repeat of that scoreline in Al Wakrah would almost certainly be enough to take the Socceroos through.
France cruising into last 16
What: Tunisia v France
Where: Education City Stadium, Al Rayyan
When: 15:00, Wednesday 30th November
How to watch: BBC1
Odds: Tunisia +700, Draw +320, France -225
Despite concerns regarding their form and a lengthy injury list heading into the finals, France have cruised into the last 16 with a game to spare and a point against Tunisia would be enough to take the defending champions through as group winners.
Head coach Didier Deschamps can even afford to rest the likes of Kylian Mbappe and Olivier Giroud for this match, although the former is currently the joint-leading scorer at the finals and will have one eye on winning the Golden Boot at +320.
Tunisia are +2000 to qualify for the knockout stages for the first time, but they must win if they are to stand any chance of achieving that feat following their defeat to Australia on Saturday.
That 1-0 reverse against the Socceroos may well have knocked the stuffing out of Jalel Kadri's side, as Tunisia aim to secure their first victory over France since 1971.
