Warwickshire, champions and runners-up in the last two Sunday League campaigns, revived their title hopes with an 18-run win against Nottinghamshire at Edgbaston.
Tight seam bowling, especially by Shaun Pollock with 2 for 21, restricted Nottinghamshire to 179 for 6 in reply to the home side's 197 for 4.
Warwickshire's fifth victory of the season was only in jeopardy during a third-wicket stand of 62 in 10 overs by Tim Robinson (52) and Paul Johnson (43).
Kent got their title defence back on track with a comfortable six-wicket victory against the bottom side Durham, winning with 29 balls to spare in front of a crowd of more than 4,000 at Maidstone. The champions were guided home by a third-wicket stand of 130 in 19 overs between Carl Hooper and Graham Cowdrey.
Glamorgan lost the toss and their first six wickets for 56 at Bristol, but stormed back to beat Gloucestershire by 94 runs. They owed their third win to Alun Evans and Otis Gibson, who put on 91 for the seventh wicket, a record stand for the Welsh club.
The West Indian all-rounder Phil Simmons, with 71 off 70 balls, steered Leicestershire to their third win of the season and their first at home with a nine-run victory over Essex in a dramatic finish at Grace Road.
Chris Adams celebrated his first game as Derbyshire skipper by becoming the fourth batsman to reach 1,000 first-class runs this season against South Africa A at Chesterfield.Reuse content