Promotion contenders Hampshire had to follow-on despite Sean Ervine's 121 on day three against Kent in Southampton.
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.
Surrey kept alive their faint hopes of promotion after earning maximum batting points against leaders Worcestershire.
Leaders Worcestershire endured a testing opening day as they were dismissed for 272 against Surrey at New Road.
Surrey have opted to leave batsman Kevin Pietersen at home for the trip to face Worcestershire.
England new boy Jason Roy has been awarded a new three-year contract at Surrey.
Matt Coles and Sean Ervine each took three cheap wickets as Hampshire crushed Leicestershire by an innings and 34 runs.
Jason Roy has allayed fears he could miss the Twenty20 International against India after folowing a hand injury
Birmingham Bears advanced to the final of the Natwest t20 Blast as they beat Surrey by 16 runs in the first semi-final.
Kevin Pietersen and Andrew Flintoff could both feature at Finals Day after the squads were unveiled on Friday.
We take a look back at some of the highlights from previous Finals Days ahead of this year's event.
Nottinghamshire's last-ball win earned them top spot in Group B and a home quarter-final in the Royal London Cup.
We look at the form and men to watch from the four teams vying for Twenty20 glory on Finals Day.
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.
Alex Hales and James Taylor scored centuries as Notts kept their Royal London One-Day Cup quarter-final hopes alive.
Ben Stokes cracked 103 to lead Durham to a crushing six-wicket victory over Notts in Group B of the Royal London Cup.
Full-on Yorkshire are the pride of the County Championship, says David Lloyd, and deservedly so.