Hampshire were favourites to secure promotion, but Kent's resistance and an Essex win have complicated matters.
Jesse Ryder claimed career-best first-class bowling figures to keep Essex in contention for promotion in Division Two.
Essex boosted their hopes of being promoted from County Championship Division Two with a nine-wicket victory over Kent.
Surrey kept alive their faint hopes of promotion after earning maximum batting points against leaders Worcestershire.
Matt Coles and Sean Ervine each took three cheap wickets as Hampshire crushed Leicestershire by an innings and 34 runs.
Warwickshire defeated Essex by 67 runs at Chelmsford to reach the semi-finals of the Royal London One-Day Cup.
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.
Essex and Hampshire both boosted their promotion hopes with victories in Division Two of the LV= County Championship.
A brilliant innings by Richard Oliver failed to prevent Worcestershire's first Championship defeat of the season.
England spinner Monty Panesar took 5-50 as Essex put themselves in a winning position against Glamorgan.
Worcestershire endured one of their worst days of the summer as they were dismissed for 194 by Gloucestershire.
Essex wicketkeeper-batsman Ben Foakes is joining Surrey at the end of the season.
Essex batsman Tom Westley has been rewarded for a superb domestic season with a new two-year contract.
Ex-Pakistan bowler Danish Kaneria has failed to appeal against the lifetime ban handed to him by the ECB for corruption.
Essex opener Tom Westley and Ryan ten Doeschate plundered centuries to help their side beat Yorkshire by five wickets.
Sussex defeated Somerset in the only one of six Royal London One-Day Cup fixtures to beat the bad weather on Sunday.
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.
Full-on Yorkshire are the pride of the County Championship, says David Lloyd, and deservedly so.