Former captain Andrew Hall and all-rounder Matt Spriegel will be released by Northamptonshire at the end of the season.
Derbyshire's home victory over Gloucestershire saw them qualify for the quarter-finals of the Royal London One-Day Cup.
Vote for your favourite catch in the NatWest T20 Blast so far from our spectacular short-list of five.
We take a look back at some of the highlights from previous Finals Days ahead of this year's event.
Yorkshire beat Sussex by nine wickets at Scarborough to move six points clear at the top of the LV= County Championship.
Paul Horton's 114 and Ashwell Prince's unbeaten half-century helped Lancashire make a spirited response to Durham's 340.
Essex opener Tom Westley and Ryan ten Doeschate plundered centuries to help their side beat Yorkshire by five wickets.
Yorkshire Vikings took control of Group A in the Royal London Cup with a three-wicket victory over Leicestershire Foxes.
Essex handed Lancashire a third straight defeat, while Gloucs beat Leics to go top of Group A in the One-Day Cup.
Gloucestershire and Worcestershire are off the mark in Group A of the Royal London One-Day Cup after contrasting wins.
Northamptonshire batsman David Sales is to retire at the end of the season after a 19-year professional career.
Wayne Madsen struck his second successive Royal London One-Day Cup ton in Derbyshire's Group A win over Leicestershire.
Birmingham Bears reached the T20 Blast quarter-finals at Yorkshire Vikings' expense in the North Group.
The inaugural Royal London One-Day Cup, county cricket's new 50-over competition, gets under way on Saturday.
Notts booked their place in the quarter-finals of the Natwest T20 Blast thanks to a 22-run victory at Northamptonshire.
NatWest T20 Blast holders Northamptonshire are on the verge of elimination following defeat to Worcestershire.
Chris Read saw Division One leaders Notts to a one-wicket victory against Lancashire, while Somerset and Warks also won.
Northants were reduced to 108-5 chasing 404 at stumps on day three against Somerset at Wantage Road.
Notts bowled out Lancashire for 225, Somerset declined to make Northants follow-on and Jonathan Trott was in the runs for Warks.
Marcus Trescothick's fourth century in eight first-class innings helped Somerset to 366-8 on day one against Northants.