It could hardly be any bigger for Scotland as they get set to take on Ukraine tonight - with a place at the 2022 World Cup on the line.
Win, and it's Cardiff on Sunday in the match that will decide the final team going to Qatar.
Lose, though, and it's curtains, with another four years to wait before our next crack at the grandest stage of all.
Ukraine travel ready for this one and key man Oleksandr Zinchenko says they're travelling to Hampden for a fight.
So Steve Clarke and his team will have to be ready if they are to keep their World Cup dream alive.
Clarke has some major calls to make as regular starters and key components of the back five, Kieran Tierney and Nathan Patterson, are out.
But there are plenty options available to step in and he'll be confident in his team to get the job done.
Here is everything you need to know ahead of the big one.
When and where will the game take place?
The game takes place at Hampden Park on Wednesday, 1 June.
Kick-off is at 7.45pm.
What channel is it on?
The match is being broadcast live on Sky Sports Main Event (Sky 401, Virgin 511) and Sky Sports Football (Sky 403, Virgin 513).
Coverage gets underway from 7pm.
Extended highlights will be shown on Sportscene on BBC One Scotland at 10.40pm.
Will there be a live stream?
Yes, subscribers can stream the match using the Sky Go app across all devices.
Non-subscribers can purchase a one-off day pass via Now TV for £9.99.
Where else can I follow the action?
You can keep up with all the action right here on dailyrecord.co.uk! We'll be running a live blog with all the pre-match build-up and team news, and every kick of the ball once the clash gets underway.
After the game, we'll have all the reaction from managers and players, as well as player ratings, talking points and a whole lot more.
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Match odds (90 mins only)
- Scotland - 5/4
- Draw - 19/10
- Ukraine - 23/10
To Qualify odds
- Scotland - 4/6
- Ukraine - 11/10
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