The Cricketer provides all the information you need ahead of three matches as the group stage reaches a climax...
Where: Bristol County Ground
When: Tuesday, September 15
Lowdown: The last time these two teams clashed it was Gloucestershire who triumphed against the Bears after not beating them in their previous four encounters. In a rain-affected 12-over game, they bowled the Bears out for just 100 having set 157.
One to watch: Gloucestershire have been bowling exceptionally well thus far in the tournament. Ryan Higgins has led such the charge with, claiming 13 wickets in just 26 overs.
Tickets: The match will be played behind closed doors.
Weather: Sunny spells with a few clouds around make it ideal cricketing conditions.
Prediction: Gloucestershire
Lancashire storm to comfortable Rose win over Yorkshire
Where: Northants County Ground
When: Tuesday, September 15
Lowdown: Northants are sitting pretty at second in the Central Group, whilst Worcestershire are bottom having only won one game. That sole success came in a last-ball win over Somerset.
One to watch: In six games, left-arm spinner Graeme White has proved dangerous with his 10 wickets. He’ll look to stem the flow of runs against Worcestershire as he has done all season.
Tickets: The match will be played behind closed doors.
Weather: It will be hot reaching 27 degrees on Tuesday. The evening could see some cloud cover.
Prediction: Northants

Ryan Higgins is preparing to be Gloucestershire's main man again
Where: Grace Road, Leicestershire
When: Tuesday, September 15
Lowdown: Their last match was abandoned due to weather so it’s the first time they’re coming head-to-head. Leicestershire have only won two games, but that is still two above Derbyshire who will be looking for their first win.
One to watch: Watch out for Colin Ackermann and Gareth Delany after their displays against Yorkshire. They’ll look to come and do the same against Derbyshire.
Tickets: The match will be played behind closed doors.
Weather: Tuesday will hit a peak of 26 degrees and it will remain sunny with some intermittent cloud.
Prediction: Leicestershire
For unrivalled coverage of the county season, subscribe to The Cricketer and receive 3 issues for £5