Will Smith's unbeaten 142 saved Hampshire from possible defeat by Kent on the final day at the Ageas Bowl.
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.
County cricket: Kent fast bowler Mark Davies forced to retire
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.
Warwickshire remain on course for a limited-overs double after beating Kent in their Royal London Cup semi-final.
Matt Coles and Sean Ervine each took three cheap wickets as Hampshire crushed Leicestershire by an innings and 34 runs.
Worcestershire's clash against Derbyshire at Derby is firmly in the balance heading into the final day of play.
Derbyshire made life difficult for Division Two leaders Worcestershire on day two, while rain frustrated Hampshire.
Derbyshire's batsmen held up Division Two leaders Worcestershire, while Angus Robson and Chris Cooke hit maiden tons.
Kent claimed the last place in the semi-finals of the Royal London One-Day Cup with a 24-run win over Gloucestershire.
Nottinghamshire's last-ball win earned them top spot in Group B and a home quarter-final in the Royal London Cup.
Vote for your favourite catch in the NatWest T20 Blast so far from our spectacular short-list of five.
Geraint Jones will leave Kent at the end of the season once his current contract expires.
A brilliant innings by Richard Oliver failed to prevent Worcestershire's first Championship defeat of the season.
Sussex defeated Somerset in the only one of six Royal London One-Day Cup fixtures to beat the bad weather on Sunday.
Phil Mustard scored a fine half-century as Durham condemned Glamorgan to a third straight Royal London Cup defeat.
Doug Bollinger claimed 5-35 as Kent eased to a six-wicket win over Glamorgan in the Royal London One-Day Cup.
Full-on Yorkshire are the pride of the County Championship, says David Lloyd, and deservedly so.
County Champ D2