A shake-up to the domestic white-ball summer will take place in 2026, including a slimmed down Vitality Blast.
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From next summer the T20 Blast competition reduces the group stages by two games to 12 matches per side, with the quarter-finals and Finals Day following on directly so the competition is wrapped up in one block.
The two groups of nine sides will be replaced by three groups of six split into north, central and south groups as they were in 2020.
The group stage of the Vitality T20 Blast reverts to three groups with North, Central and South Groups with the eight best-placed teams on points and net run-rates going through to the quarter-finals.
North Group: Nottinghamshire, Derbyshire, Lancashire, Durham, Yorkshire and Leicestershire
Central Group: Gloucestershire, Northamptonshire, Birmingham, Somerset, Glamorgan, Worcestershire
South Group: Surrey, Sussex, Kent, Middlesex, Essex, Hampshire
Each county plays the other teams in their group home and away - a total of 10 matches.
They will additionally play one home game against a county from outside their group and one away game against a side from another group.
The top two teams in each group plus the best two third-placed teams progress to the quarter-finals. The winners of the quarter-finals will progress to men's T20 Blast Finals Day.