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Essex Eagles v Surrey at 14:00 BST; Northamptonshire Steelbacks v Gloucestershire at 14:30 BST

Notts Outlaws v Lancashire Lightning at 18:00 BST

Birmingham Bears v Glamorgan, Durham v Derbyshire Falcons, Leicestershire Foxes v Yorkshire Vikings & Somerset v Worcestershire Rapids at 18:30 BST

The 18 counties split into three groups, with each side playing 10 games