Rory Kleinveldt finished with career-best match figures of 13-98 as Northants beat Nottinghamshire by 124 runs.
Steve Finn swelled Middlesex's hopes of avoiding relegation by taking 8-79 in a 36-run win over Lancashire at Lord's.
Rory Kleinveldt bagged 9-65 for Northants in the Championship, while Surrey's Kumar Sangakkara scored yet another century.
Stay across every game in the penultimate round of the County Championship as the battle to avoid relegation hots up.
Warwickshire were relegated to County Championship Division Two as Somerset beat Lancashire to boost their own survival bid
Somerset are closing in on a crucial victory in their fight for County Championship Division One survival.
Essex edged closer to the County Championship title after making a strong start to their match against Warwickshire at Edgbaston.
Haseeb Hameed missed out on a first Championship hundred of 2017, while Notts' unbeaten run is in jeopardy at Trent Bridge.
England quick Mark Wood shone to rally Durham against Kent on his return to County Championship action from a heel injury.
Ben Duckett creamed 193 for Northants in the County Championship but rain blighted much of day one elsewhere.
It's that time again; the biggest race of the year! Find out who comes out in top in the 2017 Mascot Race...
Northamptonshire have signed Lancashire all-rounder Luke Procter on loan in a bid to ease their injury problems.
Rikki Clarke took a career-best 7-55 but Somerset still managed to score 269 against Surrey thanks to Steven Davies' 86.
Ravichandran Ashwin took 5-68 on debut as Worcestershire beat Gloucestershire by 189 runs at New Road.
Keaton Jennings' torrid form continued as he fell first ball on day one of Durham's County Championship game with Derbyshire.
Leicestershire, Surrey and Somerset sealed places in the T20 Blast quarter-finals after the final round of group games.
Adam Lyth blasted 161 from 73 balls, the highest individual score in English T20, as Yorkshire hit 260-4 to beat Northants.
Tim Bresnan's 6-19 helped Yorkshire win a dramatic NatWest T20 Blast Roses game against Lancashire by 19 runs.
Nottinghamshire moved closer to County Championship Division One after crushing Derbyshire by an innings and 61 runs.
Chris Woakes starred as Warwickshire bowled Middlesex out for just 136 to win their County Championship Division One match.
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