Five quarter-final places filled on last night
Notts, Derbyshire, Birmingham and Leicestershire through in North Group
Glamorgan, Surrey, Hampshire and Somerset progress from South Group
Here's a look at the all important group tables.
We'll talk you through who needs to do what in a second.
Starting with the North Group....
Image source, .And here's the state of play in the South Group...
Image source, .
Image source, Getty ImagesIn fact, only three teams know for certain that they will be in next week's quarter-finals and only one of them, Notts Outlaws, have guaranteed themselves a home tie.
The other two sides who know they'll be in the quarter-finals, home or away depending on their fortunes tonight - are Glamorgan and Hampshire.
Eyes down as shortly we're going to attempt to explain as best we can, who needs what this evening to reach the last eight.
But, first we'll show you how the two groups look going into the last night....
Image source, Rex FeaturesEight matches tonight, all of them with some potential bearing on the quarter-finals.
All matches start at 19:00 BST:
North Group:
South Group:
Image source, Getty ImagesSo, after it all started back on Friday, 7 July - here we are at the final night of group matches in this year's T20 Blast.
There's been big hits, big wickets and big catches aplenty already in this year's competition and that's even before we've whittled the number of sides down to eight.
Tonight, the quarter-final line-up will be determined and no fewer than 14 counties still have a mathematical chance of booking their place in them next week.
Strap yourselves in, we're in for a bumper night!