In the zonal matches Lancashire, still unbeaten in all competitions this season, amassed 353 for 7 against Nottinghamshire on the same ground - a record for the competition between two first-class counties.
Worcestershire will also be looking for revenge against Yorkshire at Headingley after losing their only one-day match of the season against them in the zonal stages. But last season's finalists have a doubt over whether their Australian all-rounder, Tom Moody, will be able to perform his stint with the ball.
Yorkshire, without their captain, Martyn Moxon (cracked thumb), are awaiting a late check on all-rounder Paul Grayson, who has been ill.
Kent have lost seven of their past 10 meetings with Middlesex, whom they face at Canterbury, while Gloucestershire meet Somerset in a local derby at Bristol, with Jack Russell looking to improve on the season's good deeds to date. "We've still got a lot to do; we've not achieved anything yet, but we are going in the right direction," the Gloucestershire captain said.Reuse content